diff --git a/glxgears.c b/glxgears.c
index e6f6ba2..471c97e 100644
--- a/glxgears.c
+++ b/glxgears.c
@@ -222,7 +222,7 @@ static void draw(void) {
 		Frames = 0;
 		if ((t >= 999.0 * autoexit) && (autoexit)) {
 			cleanup();
-			exit(0);
+			exit(EXIT_SUCCESS);
 		}
 	}
 }
@@ -268,7 +268,7 @@ static void key(unsigned char k, int, int) {
 			break;
 		case 27: /* Escape */
 			cleanup();
-			exit(0);
+			exit(EXIT_SUCCESS);
 			break;
 		default:
 			return;
@@ -379,5 +379,5 @@ int main(int argc, char *argv[]) {
 	update_idle_func();
 
 	glutMainLoop();
-	return 0; /* ANSI C requires main to return int. */
+	return EXIT_SUCCESS;
 }