diff --git a/src/libfsm/gen.c b/src/libfsm/gen.c
index 730b40724..790579dc8 100644
--- a/src/libfsm/gen.c
+++ b/src/libfsm/gen.c
@@ -193,7 +193,7 @@ gen_init_outer(struct fsm *fsm, size_t max_length,
     fsm_generate_matches_cb *cb, void *opaque,
     bool randomized, unsigned seed)
 {
-	int res = 0;
+	int res = false;
 	if (fsm == NULL || cb == NULL || max_length == 0) {
 		return false;
 	}
@@ -222,11 +222,11 @@ gen_init_outer(struct fsm *fsm, size_t max_length,
 		goto cleanup;
 	}
 
-	res = 1;
+	res = true;
 
 	while (!ctx.done) {
 		if (!gen_iter(&ctx)) {
-			res = 0;
+			res = false;
 			break;
 		}
 	}
diff --git a/src/re/main.c b/src/re/main.c
index 78bc77a2f..1a0d5cbe1 100644
--- a/src/re/main.c
+++ b/src/re/main.c
@@ -1047,7 +1047,11 @@ main(int argc, char *argv[])
 	}
 
 	if (generate_bounds > 0) {
-		return fsm_generate_matches(fsm, generate_bounds, fsm_generate_cb_printf_escaped, &opt);
+		if (!fsm_generate_matches(fsm, generate_bounds, fsm_generate_cb_printf_escaped, &opt)) {
+			exit(EXIT_FAILURE);
+		}
+
+		return 0;
 	}
 
 	if (fsm_lang != FSM_PRINT_NONE) {