diff --git a/src/tests/system/libroot/posix/signal_in_allocator_test.cpp b/src/tests/system/libroot/posix/signal_in_allocator_test.cpp
index c1e3b794bf..35aa52d375 100644
--- a/src/tests/system/libroot/posix/signal_in_allocator_test.cpp
+++ b/src/tests/system/libroot/posix/signal_in_allocator_test.cpp
@@ -72,7 +72,7 @@ main()
 	kill_thread(signalThread);
 	snooze(1000);
 
-	printf("test successful, handled %lld signals\n", sHandledSignals);
+	printf("test successful, handled %" B_PRId64 " signals\n", sHandledSignals);
 
 	return 0;
 }