diff --git a/system/lib/libc/musl/src/thread/__timedwait.c b/system/lib/libc/musl/src/thread/__timedwait.c
index c90b94df73618..5d37774c8555a 100644
--- a/system/lib/libc/musl/src/thread/__timedwait.c
+++ b/system/lib/libc/musl/src/thread/__timedwait.c
@@ -61,9 +61,6 @@ int __timedwait_cp(volatile int *addr, int val,
 	double msecsToSleep = top ? (top->tv_sec * 1000 + top->tv_nsec / 1000000.0) : INFINITY;
 	int is_runtime_thread = emscripten_is_main_runtime_thread();
 
-	// Main runtime thread may need to run proxied calls, so sleep in very small slices to be responsive.
-	double max_ms_slice_to_sleep = is_runtime_thread ? 1 : 100;
-
 	// cp suffix in the function name means "cancellation point", so this wait can be cancelled
 	// by the users unless current threads cancelability is set to PTHREAD_CANCEL_DISABLE
 	// which may be either done by the user of __timedwait() function.
@@ -71,6 +68,9 @@ int __timedwait_cp(volatile int *addr, int val,
 	if (is_runtime_thread ||
 	    self->canceldisable != PTHREAD_CANCEL_DISABLE ||
 	    self->cancelasync) {
+		// Main runtime thread may need to run proxied calls, so sleep in very small slices to be responsive.
+		double max_ms_slice_to_sleep = is_runtime_thread ? 1 : 100;
+
 		double sleepUntilTime = emscripten_get_now() + msecsToSleep;
 		do {
 			if (self->cancel) {
diff --git a/test/codesize/test_codesize_minimal_pthreads.json b/test/codesize/test_codesize_minimal_pthreads.json
index 46134024d4f69..ed8abbc889665 100644
--- a/test/codesize/test_codesize_minimal_pthreads.json
+++ b/test/codesize/test_codesize_minimal_pthreads.json
@@ -1,10 +1,10 @@
 {
   "a.out.js": 7363,
   "a.out.js.gz": 3604,
-  "a.out.nodebug.wasm": 19259,
-  "a.out.nodebug.wasm.gz": 8931,
-  "total": 26622,
-  "total_gz": 12535,
+  "a.out.nodebug.wasm": 19256,
+  "a.out.nodebug.wasm.gz": 8935,
+  "total": 26619,
+  "total_gz": 12539,
   "sent": [
     "a (memory)",
     "b (emscripten_get_now)",
diff --git a/test/codesize/test_codesize_minimal_pthreads_memgrowth.json b/test/codesize/test_codesize_minimal_pthreads_memgrowth.json
index bd269f796de58..50a3f3afc8a34 100644
--- a/test/codesize/test_codesize_minimal_pthreads_memgrowth.json
+++ b/test/codesize/test_codesize_minimal_pthreads_memgrowth.json
@@ -1,10 +1,10 @@
 {
   "a.out.js": 7765,
   "a.out.js.gz": 3810,
-  "a.out.nodebug.wasm": 19260,
-  "a.out.nodebug.wasm.gz": 8933,
-  "total": 27025,
-  "total_gz": 12743,
+  "a.out.nodebug.wasm": 19257,
+  "a.out.nodebug.wasm.gz": 8936,
+  "total": 27022,
+  "total_gz": 12746,
   "sent": [
     "a (memory)",
     "b (emscripten_get_now)",