diff --git a/test-genrandom.c b/test-genrandom.c
index 8cefe6cfed..8ad276d062 100644
--- a/test-genrandom.c
+++ b/test-genrandom.c
@@ -13,7 +13,7 @@ int main(int argc, char *argv[])
 	unsigned char *c;
 
 	if (argc < 2 || argc > 3) {
-		fprintf( stderr, "Usage: %s <seed_string> [<size>]", argv[0]);
+		fprintf(stderr, "Usage: %s <seed_string> [<size>]\n", argv[0]);
 		return 1;
 	}