diff --git a/acceptance/selftest/timeout/output.txt b/acceptance/selftest/timeout/output.txt
index b30a90be33e..edeb4690882 100644
--- a/acceptance/selftest/timeout/output.txt
+++ b/acceptance/selftest/timeout/output.txt
@@ -1,4 +1,4 @@
 
 >>> sleep 4
 
-Error: Test script killed due to a timeout (500ms)
+Error: Test script killed due to a timeout (2s)
diff --git a/acceptance/selftest/timeout/test.toml b/acceptance/selftest/timeout/test.toml
index 86623b42b6b..bcae84e4dbf 100644
--- a/acceptance/selftest/timeout/test.toml
+++ b/acceptance/selftest/timeout/test.toml
@@ -1,5 +1,6 @@
-# Test that timeout mechanism works (script sleeps 4s but should be killed much sooner)
-Timeout = '500ms'
-TimeoutWindows = '500ms'
-TimeoutCloud = '500ms'
+# Test that timeout mechanism works (script sleeps 4s but should be killed much sooner).
+# 2s rather than less: on a slow Windows runner bash may not reach `trace sleep 4` within 500ms.
+Timeout = '2s'
+TimeoutWindows = '2s'
+TimeoutCloud = '2s'
 TimeoutCIMultiplier = 1