diff --git a/test/core/test_poll_blocking.c b/test/core/test_poll_blocking.c
index bdbd6b1ee1571..36725c49e48ec 100644
--- a/test/core/test_poll_blocking.c
+++ b/test/core/test_poll_blocking.c
@@ -40,7 +40,7 @@ void test_timeout_without_fds() {
 
   int64_t duration = timeval_delta_ms(&begin, &end);
   printf(" -> duration: %lld ms\n", duration);
-  assert(duration >= TIMEOUT_MS);
+  assert(duration >= TIMEOUT_MS - 1);
 }
 
 // Check if timeout works with fds without events
@@ -58,7 +58,7 @@ void test_timeout_with_fds_without_events() {
 
   int64_t duration = timeval_delta_ms(&begin, &end);
   printf(" -> duration: %lld ms\n", duration);
-  assert(duration >= TIMEOUT_MS);
+  assert(duration >= TIMEOUT_MS - 1);
 
   close(pipe_a[0]); close(pipe_a[1]);
 }
@@ -96,7 +96,7 @@ void test_unblock_poll() {
 
   int64_t duration = timeval_delta_ms(&begin, &end);
   printf(" -> duration: %lld ms\n", duration);
-  assert(duration >= TIMEOUT_MS);
+  assert(duration >= TIMEOUT_MS - 1);
 
   pthread_join(tid, NULL);
 
@@ -115,7 +115,7 @@ void *do_poll_in_thread(void * arg) {
 
   int64_t duration = timeval_delta_ms(&begin, &end);
   printf(" -> duration: %lld ms\n", duration);
-  assert((duration >= TIMEOUT_MS) && (duration < 4000));
+  assert((duration >= TIMEOUT_MS - 1) && (duration < 4000));
 
   return NULL;
 }
diff --git a/test/core/test_poll_blocking_asyncify.c b/test/core/test_poll_blocking_asyncify.c
index b4d9bf6c735a5..bb3b5a6ec24d5 100644
--- a/test/core/test_poll_blocking_asyncify.c
+++ b/test/core/test_poll_blocking_asyncify.c
@@ -37,7 +37,7 @@ void test_timeout_without_fds() {
 
   int64_t duration = timeval_delta_ms(&begin, &end);
   printf(" -> duration: %lld ms\n", duration);
-  assert(duration >= 1000);
+  assert(duration >= 1000 - 1);
 }
 
 int pipe_shared[2];
@@ -69,7 +69,7 @@ void test_unblock_poll() {
 
   int64_t duration = timeval_delta_ms(&begin, &end);
   printf(" -> duration: %lld ms\n", duration);
-  assert(duration >= 1000);
+  assert(duration >= 1000 - 1);
 
   close(pipe_a[0]); close(pipe_a[1]);
   close(pipe_shared[0]); close(pipe_shared[1]);
diff --git a/test/core/test_select_blocking.c b/test/core/test_select_blocking.c
index ddedab1aee851..2c23a26e7c1b1 100644
--- a/test/core/test_select_blocking.c
+++ b/test/core/test_select_blocking.c
@@ -39,7 +39,7 @@ void test_timeout_without_fds() {
 
   int64_t duration = timeval_delta_ms(&begin, &end);
   printf(" -> duration: %lld ms\n", duration);
-  assert(duration >= TIMEOUT_MS);
+  assert(duration >= TIMEOUT_MS - 1);
 }
 
 // Check if timeout works with fds without events
@@ -61,7 +61,7 @@ void test_timeout_with_fds_without_events() {
 
   int64_t duration = timeval_delta_ms(&begin, &end);
   printf(" -> duration: %lld ms\n", duration);
-  assert(duration >= TIMEOUT_MS);
+  assert(duration >= TIMEOUT_MS - 1);
 
   close(pipe_a[0]); close(pipe_a[1]);
 }
@@ -100,7 +100,7 @@ void test_unblock_select() {
 
   int64_t duration = timeval_delta_ms(&begin, &end);
   printf(" -> duration: %lld ms\n", duration);
-  assert(duration >= TIMEOUT_MS);
+  assert(duration >= TIMEOUT_MS - 1);
 
   pthread_join(tid, NULL);
 
@@ -126,7 +126,7 @@ void *do_select_in_thread(void * arg) {
 
   int64_t duration = timeval_delta_ms(&begin, &end);
   printf(" -> duration: %lld ms\n", duration);
-  assert((duration >= TIMEOUT_MS) && (duration < 4000));
+  assert((duration >= TIMEOUT_MS - 1) && (duration < 4000));
 
   return NULL;
 }