diff --git a/src/vm.c b/src/vm.c
index e813544..6168d29 100644
--- a/src/vm.c
+++ b/src/vm.c
@@ -89,27 +89,38 @@ void krk_forceThreadData(void) {
 #endif
 
 #if !defined(KRK_NO_TRACING) && !defined(__EMSCRIPTEN__)
-# define FRAME_IN(frame) if (vm.globalFlags & KRK_GLOBAL_CALLGRIND) { clock_gettime(CLOCK_MONOTONIC, &frame->in_time); }
-# define FRAME_OUT(frame) \
-	if (vm.globalFlags & KRK_GLOBAL_CALLGRIND && !(frame->closure->function->obj.flags & KRK_OBJ_FLAGS_CODEOBJECT_IS_GENERATOR)) { \
-		KrkCallFrame * caller = krk_currentThread.frameCount > 1 ? &krk_currentThread.frames[krk_currentThread.frameCount-2] : NULL; \
-		struct timespec outTime; \
-		clock_gettime(CLOCK_MONOTONIC, &outTime); \
-		struct timespec diff; \
-		diff.tv_sec  = outTime.tv_sec  - frame->in_time.tv_sec; \
-		diff.tv_nsec = outTime.tv_nsec - frame->in_time.tv_nsec; \
-		if (diff.tv_nsec < 0) { diff.tv_sec--; diff.tv_nsec += 1000000000L; } \
-		fprintf(vm.callgrindFile, "%s %s@%p %d %s %s@%p %d %lld.%.9ld\n", \
-			caller ? (caller->closure->function->chunk.filename->chars) : "stdin", \
-			caller ? (caller->closure->function->qualname ? caller->closure->function->qualname->chars : caller->closure->function->name->chars) : "(root)", \
-			caller ? ((void*)caller->closure->function) : NULL, \
-			caller ? ((int)krk_lineNumber(&caller->closure->function->chunk, caller->ip - caller->closure->function->chunk.code)) : 1, \
-			frame->closure->function->chunk.filename->chars, \
-			frame->closure->function->qualname ? frame->closure->function->qualname->chars : frame->closure->function->name->chars, \
-			(void*)frame->closure->function, \
-			(int)krk_lineNumber(&frame->closure->function->chunk, 0), \
-			(long long)diff.tv_sec, diff.tv_nsec); \
+static void _frame_in(KrkCallFrame * frame) {
+	 clock_gettime(CLOCK_MONOTONIC, &frame->in_time);
+}
+static void _frame_out(KrkCallFrame * frame) {
+	if (frame->closure->function->obj.flags & KRK_OBJ_FLAGS_CODEOBJECT_IS_GENERATOR) return;
+
+	KrkCallFrame * caller = krk_currentThread.frameCount > 1 ? &krk_currentThread.frames[krk_currentThread.frameCount-2] : NULL;
+
+	struct timespec outTime, diff;
+
+	clock_gettime(CLOCK_MONOTONIC, &outTime);
+	diff.tv_sec  = outTime.tv_sec  - frame->in_time.tv_sec;
+	diff.tv_nsec = outTime.tv_nsec - frame->in_time.tv_nsec;
+
+	if (diff.tv_nsec < 0) {
+		diff.tv_sec--;
+		diff.tv_nsec += 1000000000L;
 	}
+
+	fprintf(vm.callgrindFile, "%s %s@%p %d %s %s@%p %d %lld.%.9ld\n",
+		caller ? (caller->closure->function->chunk.filename->chars) : "stdin",
+		caller ? (caller->closure->function->qualname ? caller->closure->function->qualname->chars : caller->closure->function->name->chars) : "(root)",
+		caller ? ((void*)caller->closure->function) : NULL,
+		caller ? ((int)krk_lineNumber(&caller->closure->function->chunk, caller->ip - caller->closure->function->chunk.code)) : 1,
+		frame->closure->function->chunk.filename->chars,
+		frame->closure->function->qualname ? frame->closure->function->qualname->chars : frame->closure->function->name->chars,
+		(void*)frame->closure->function,
+		(int)krk_lineNumber(&frame->closure->function->chunk, 0),
+		(long long)diff.tv_sec, diff.tv_nsec);
+}
+# define FRAME_IN(frame) if (unlikely(vm.globalFlags & KRK_GLOBAL_CALLGRIND)) { _frame_in(frame); }
+# define FRAME_OUT(frame) if (unlikely(vm.globalFlags & KRK_GLOBAL_CALLGRIND)) { _frame_out(frame); }
 #else
 # define FRAME_IN(frame)
 # define FRAME_OUT(frame)