diff --git a/src/system/libroot/posix/signal/signal.c b/src/system/libroot/posix/signal/signal.c
index 07dc4cc8ea..b08050c29e 100644
--- a/src/system/libroot/posix/signal/signal.c
+++ b/src/system/libroot/posix/signal/signal.c
@@ -27,7 +27,7 @@ signal(int sig, sig_func_t signalHandler)
 	// the current thread (the original is copied into the last param)
 	err = sigaction(sig, &newAction, &oldAction);
 	if (err < B_OK) {
-		errno = err;
+		errno = 1;
 		return SIG_ERR;
 	}