diff --git a/core/testing/runner_windows.odin b/core/testing/runner_windows.odin
index 513f1a077..e6bf40807 100644
--- a/core/testing/runner_windows.odin
+++ b/core/testing/runner_windows.odin
@@ -149,6 +149,8 @@ thread_terminate :: proc "contextless" (thread: ^Thread, exit_code: int) {
 
 
 _fail_timeout :: proc(t: ^T, duration: time.Duration, loc := #caller_location) {
+	assert(global_fail_timeout_thread == nil, "set_fail_timeout previously called", loc)
+	
 	thread := thread_create(proc(thread: ^Thread) {
 		t := thread.t
 		timeout := thread.internal_fail_timeout
diff --git a/core/testing/testing.odin b/core/testing/testing.odin
index 63df26c1f..37f9fe4d9 100644
--- a/core/testing/testing.odin
+++ b/core/testing/testing.odin
@@ -99,6 +99,5 @@ expect_value :: proc(t: ^T, value, expected: $T, loc := #caller_location) -> boo
 
 
 set_fail_timeout :: proc(t: ^T, duration: time.Duration, loc := #caller_location) {
-	assert(global_fail_timeout_thread == nil, "set_fail_timeout previously called", loc)
 	_fail_timeout(t, duration, loc)
 }
\ No newline at end of file