diff --git a/src/c/unixint.d b/src/c/unixint.d
index 435b66f..5ff4fed 100644
--- a/src/c/unixint.d
+++ b/src/c/unixint.d
@@ -666,9 +666,12 @@ signal_validate(int sig)
 {
 	int i, known = 0;
 
-	for (i = 0; known_signals[i].code >= 0; i++)
-		if (known_signals[i].code == sig)
+	for (i = 0; known_signals[i].code >= 0; i++) {
+		if (known_signals[i].code == sig) {
 			known = 1;
+			break;
+		}
+	}
 	if (known == 0)
 		FEerror("Unknown signal number ~A.", 1, MAKE_FIXNUM(sig));