diff --git a/WPrefs.app/main.c b/WPrefs.app/main.c
index 1ad2edb..fb0d745 100644
--- a/WPrefs.app/main.c
+++ b/WPrefs.app/main.c
@@ -83,8 +83,13 @@ void AddDeadChildHandler(pid_t pid, void (*handler) (void *), void *data)
 static void crash_handler(int sig) {
 	void *bt[32];
 	int n = backtrace(bt, 32);
-	fprintf(stderr, "\n=== WPrefs CRASH (signal %d) ===\n", sig);
+	const char *msg = "\n=== WPrefs CRASH ===\n";
+	write(STDERR_FILENO, msg, strlen(msg));
+	char sigbuf[32];
+	int slen = snprintf(sigbuf, sizeof(sigbuf), "signal %d\n", sig);
+	write(STDERR_FILENO, sigbuf, slen);
 	backtrace_symbols_fd(bt, n, STDERR_FILENO);
+	fsync(STDERR_FILENO);
 	_exit(1);
 }