diff --git a/CHANGELOG.md b/CHANGELOG.md
index b4ff09d91bb..7ae7e25f5b0 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -38,6 +38,7 @@
 #### :house: Internal
 
 - Reanalyze server: redesign incremental fixpoint with delete-then-rederive strategy and predecessor tracking, improving speed on deletions. https://github.com/rescript-lang/rescript/pull/8276
+- Fix build tests failing silently. https://github.com/rescript-lang/rescript/pull/8295
 
 # 13.0.0-alpha.2
 
diff --git a/lib_dev/process.js b/lib_dev/process.js
index 469c653ffcf..6a7d0cfb0c4 100644
--- a/lib_dev/process.js
+++ b/lib_dev/process.js
@@ -32,6 +32,7 @@ export const {
   execBin,
   rescript,
   execBuild,
+  execBuildOrThrow,
   execClean,
 } = setup();
 
@@ -196,6 +197,25 @@ export function setup(cwd = process.cwd()) {
       return exec(rescript_exe, ["build", ...args], options);
     },
 
+    /**
+     * Execute ReScript `build` command directly and throw on non-zero exit
+     * while preserving captured stdout/stderr for quiet successful tests.
+     *
+     * @param {string[]} [args]
+     * @param {ExecOptions} [options]
+     * @return {Promise<ExecResult>}
+     */
+    async execBuildOrThrow(args = [], options = {}) {
+      const out = await exec(rescript_exe, ["build", ...args], options);
+      if (out.status !== 0) {
+        const err = new Error("ReScript build failed");
+        err.stack = out.stdout + out.stderr;
+        Object.assign(err, { execResult: out });
+        throw err;
+      }
+      return out;
+    },
+
     /**
      * Execute ReScript `clean` command directly
      *
diff --git a/tests/build_tests/case3/input.js b/tests/build_tests/case3/input.js
index d2a494dc429..009ce15184b 100644
--- a/tests/build_tests/case3/input.js
+++ b/tests/build_tests/case3/input.js
@@ -5,10 +5,10 @@ import fs from "node:fs/promises";
 import path from "node:path";
 import { setup } from "#dev/process";
 
-const { execBuild, execClean } = setup(import.meta.dirname);
+const { execBuildOrThrow, execClean } = setup(import.meta.dirname);
 
 await execClean();
-await execBuild();
+await execBuildOrThrow();
 
 const o = await fs.readFile(path.join("src", "hello.res.js"), "ascii");
 assert.ok(/HelloGen\.f/.test(o));
diff --git a/tests/build_tests/custom_namespace/input.js b/tests/build_tests/custom_namespace/input.js
index 718d172356a..80893892e12 100644
--- a/tests/build_tests/custom_namespace/input.js
+++ b/tests/build_tests/custom_namespace/input.js
@@ -1,10 +1,10 @@
 import * as assert from "node:assert";
 import { setup } from "#dev/process";
 
-const { execClean, execBuild } = setup(import.meta.dirname);
+const { execClean, execBuildOrThrow } = setup(import.meta.dirname);
 
 await execClean();
-await execBuild();
+await execBuildOrThrow();
 
 const x = await import("./src/demo.res.js");
 assert.equal(x.v, 42);
diff --git a/tests/build_tests/devonly/input.js b/tests/build_tests/devonly/input.js
index 50a4ceabd18..4df37430ada 100644
--- a/tests/build_tests/devonly/input.js
+++ b/tests/build_tests/devonly/input.js
@@ -2,6 +2,6 @@
 
 import { setup } from "#dev/process";
 
-const { execBuild } = setup(import.meta.dirname);
+const { execBuildOrThrow } = setup(import.meta.dirname);
 
-await execBuild();
+await execBuildOrThrow();
diff --git a/tests/build_tests/exports/input.js b/tests/build_tests/exports/input.js
index dd8449f36b2..e5cbd070df4 100644
--- a/tests/build_tests/exports/input.js
+++ b/tests/build_tests/exports/input.js
@@ -2,7 +2,8 @@
 
 import { setup } from "#dev/process";
 
-const { execBuild, execClean } = setup(import.meta.dirname);
+const { execBuildOrThrow, execClean } = setup(import.meta.dirname);
 
-await execBuild();
+await execClean();
+await execBuildOrThrow();
 await execClean();
diff --git a/tests/build_tests/hyphen2/input.js b/tests/build_tests/hyphen2/input.js
index dd8449f36b2..209170d17dc 100644
--- a/tests/build_tests/hyphen2/input.js
+++ b/tests/build_tests/hyphen2/input.js
@@ -2,7 +2,7 @@
 
 import { setup } from "#dev/process";
 
-const { execBuild, execClean } = setup(import.meta.dirname);
+const { execBuildOrThrow, execClean } = setup(import.meta.dirname);
 
-await execBuild();
+await execBuildOrThrow();
 await execClean();
diff --git a/tests/build_tests/jsx_settings_inheritance/input.js b/tests/build_tests/jsx_settings_inheritance/input.js
index 6d8beddd227..87b4895e426 100644
--- a/tests/build_tests/jsx_settings_inheritance/input.js
+++ b/tests/build_tests/jsx_settings_inheritance/input.js
@@ -2,7 +2,7 @@
 
 import { setup } from "#dev/process";
 
-const { execBuild, execClean } = setup(import.meta.dirname);
+const { execBuildOrThrow, execClean } = setup(import.meta.dirname);
 
 await execClean();
-await execBuild();
+await execBuildOrThrow();
diff --git a/tests/build_tests/nested/input.js b/tests/build_tests/nested/input.js
index 16b721cac26..0d5bc6809ce 100644
--- a/tests/build_tests/nested/input.js
+++ b/tests/build_tests/nested/input.js
@@ -5,9 +5,9 @@ import * as fs from "node:fs/promises";
 import * as path from "node:path";
 import { setup } from "#dev/process";
 
-const { execBuild, execClean } = setup(import.meta.dirname);
+const { execBuildOrThrow, execClean } = setup(import.meta.dirname);
 
-await execBuild();
+await execBuildOrThrow();
 
 const content = await fs.readFile(
   path.join(import.meta.dirname, "src", "demo.js"),
diff --git a/tests/build_tests/nnest/input.js b/tests/build_tests/nnest/input.js
index bef91995b48..5ac0957f6a7 100644
--- a/tests/build_tests/nnest/input.js
+++ b/tests/build_tests/nnest/input.js
@@ -5,9 +5,9 @@ import * as fs from "node:fs/promises";
 import * as path from "node:path";
 import { setup } from "#dev/process";
 
-const { execBuild, execClean } = setup(import.meta.dirname);
+const { execBuildOrThrow, execClean } = setup(import.meta.dirname);
 
-await execBuild();
+await execBuildOrThrow();
 
 const content = await fs.readFile(
   path.join(import.meta.dirname, "src", "demo.js"),
diff --git a/tests/build_tests/ns/input.js b/tests/build_tests/ns/input.js
index 50a4ceabd18..4df37430ada 100755
--- a/tests/build_tests/ns/input.js
+++ b/tests/build_tests/ns/input.js
@@ -2,6 +2,6 @@
 
 import { setup } from "#dev/process";
 
-const { execBuild } = setup(import.meta.dirname);
+const { execBuildOrThrow } = setup(import.meta.dirname);
 
-await execBuild();
+await execBuildOrThrow();
diff --git a/tests/build_tests/react_ppx/input.js b/tests/build_tests/react_ppx/input.js
index 50a4ceabd18..4df37430ada 100644
--- a/tests/build_tests/react_ppx/input.js
+++ b/tests/build_tests/react_ppx/input.js
@@ -2,6 +2,6 @@
 
 import { setup } from "#dev/process";
 
-const { execBuild } = setup(import.meta.dirname);
+const { execBuildOrThrow } = setup(import.meta.dirname);
 
-await execBuild();
+await execBuildOrThrow();
diff --git a/tests/build_tests/react_ppx/src/gpr_3695_test.res b/tests/build_tests/react_ppx/src/gpr_3695_test.res
index e190a476908..d089c2e36f9 100644
--- a/tests/build_tests/react_ppx/src/gpr_3695_test.res
+++ b/tests/build_tests/react_ppx/src/gpr_3695_test.res
@@ -1,6 +1,6 @@
 module React = {
   type element
-  type componentLike<'props, 'return> = 'props => 'return
+  type component<'props> = 'props => element
 }
 
 module Test = {
diff --git a/tests/build_tests/transitive_dependency/a/tests/test.res b/tests/build_tests/transitive_dependency/a/tests/test.res
index aa7a48d65d5..6b797705d41 100644
--- a/tests/build_tests/transitive_dependency/a/tests/test.res
+++ b/tests/build_tests/transitive_dependency/a/tests/test.res
@@ -1 +1 @@
-Js.Console.log("test")
+Console.log("test")
diff --git a/tests/build_tests/transitive_dependency/input.js b/tests/build_tests/transitive_dependency/input.js
index 765a1f4c7ad..48f21ab2bee 100644
--- a/tests/build_tests/transitive_dependency/input.js
+++ b/tests/build_tests/transitive_dependency/input.js
@@ -5,9 +5,11 @@ import { existsSync } from "node:fs";
 import * as path from "node:path";
 import { setup } from "#dev/process";
 
-const { execBuild, execClean } = setup(path.join(import.meta.dirname, "a"));
+const { execBuildOrThrow, execClean } = setup(
+  path.join(import.meta.dirname, "a"),
+);
 await execClean();
-await execBuild();
+await execBuildOrThrow();
 
 assert.ok(
   !existsSync(
diff --git a/tests/build_tests/uncurried-always/input.js b/tests/build_tests/uncurried-always/input.js
index dd8449f36b2..209170d17dc 100644
--- a/tests/build_tests/uncurried-always/input.js
+++ b/tests/build_tests/uncurried-always/input.js
@@ -2,7 +2,7 @@
 
 import { setup } from "#dev/process";
 
-const { execBuild, execClean } = setup(import.meta.dirname);
+const { execBuildOrThrow, execClean } = setup(import.meta.dirname);
 
-await execBuild();
+await execBuildOrThrow();
 await execClean();
diff --git a/tests/build_tests/unicode/input.js b/tests/build_tests/unicode/input.js
index c6cdc701f83..7c68350b899 100644
--- a/tests/build_tests/unicode/input.js
+++ b/tests/build_tests/unicode/input.js
@@ -4,14 +4,14 @@ import * as fs from "node:fs/promises";
 import * as path from "node:path";
 import { setup } from "#dev/process";
 
-const { execBuild, execClean } = setup(import.meta.dirname);
+const { execBuildOrThrow, execClean } = setup(import.meta.dirname);
 
 if (process.platform === "win32") {
   console.log("Skipping test on Windows");
   process.exit(0);
 }
 
-await execBuild();
+await execBuildOrThrow();
 
 await fs.access(
   path.join(import.meta.dirname, "lib", "bs", "src", "📕annotation", "a.js"),
diff --git a/tests/build_tests/x-y/input.js b/tests/build_tests/x-y/input.js
index dd8449f36b2..209170d17dc 100644
--- a/tests/build_tests/x-y/input.js
+++ b/tests/build_tests/x-y/input.js
@@ -2,7 +2,7 @@
 
 import { setup } from "#dev/process";
 
-const { execBuild, execClean } = setup(import.meta.dirname);
+const { execBuildOrThrow, execClean } = setup(import.meta.dirname);
 
-await execBuild();
+await execBuildOrThrow();
 await execClean();