diff --git a/src/library_async.js b/src/library_async.js
index 9327bc3b495ff..82a2be73643a1 100644
--- a/src/library_async.js
+++ b/src/library_async.js
@@ -123,7 +123,7 @@ addToLibrary({
 #endif
           ret[x] = (...args) => {
 #if ASYNCIFY_DEBUG >= 2
-            dbg(`ASYNCIFY: ${'  '.repeat(Asyncify.exportCallStack.length} try ${x}`);
+            dbg(`ASYNCIFY: ${'  '.repeat(Asyncify.exportCallStack.length)} try ${x}`);
 #endif
 #if ASYNCIFY == 1
             Asyncify.exportCallStack.push(x);
@@ -254,7 +254,7 @@ addToLibrary({
     setDataRewindFunc(ptr) {
       var bottomOfCallStack = Asyncify.exportCallStack[0];
 #if ASYNCIFY_DEBUG >= 2
-      dbg('ASYNCIFY: setDataRewindFunc('+ptr+'), bottomOfCallStack is', bottomOfCallStack, new Error().stack);
+      dbg(`ASYNCIFY: setDataRewindFunc(${ptr}), bottomOfCallStack is`, bottomOfCallStack, new Error().stack);
 #endif
       var rewindId = Asyncify.getCallStackId(bottomOfCallStack);
       {{{ makeSetValue('ptr', C_STRUCTS.asyncify_data_s.rewind_id, 'rewindId', 'i32') }}};
diff --git a/test/test_other.py b/test/test_other.py
index 7ec4fa2540284..78da8b5be5d49 100644
--- a/test/test_other.py
+++ b/test/test_other.py
@@ -10776,7 +10776,7 @@ def test_asyncify_advise(self):
     self.assertContained('[asyncify] i can', out)
 
   def test_asyncify_stack_overflow(self):
-    self.emcc_args = ['-sASYNCIFY', '-sASYNCIFY_STACK_SIZE=4']
+    self.emcc_args = ['-sASYNCIFY', '-sASYNCIFY_STACK_SIZE=4', '-sASYNCIFY_DEBUG=2']
 
     # The unreachable error on small stack sizes is not super-helpful. Try at
     # least to hint at increasing the stack size.