diff --git a/tests/tests-c-compiler/check-src/check-30.-fwide-types.c b/tests/tests-c-compiler/check-src/check-30.-fwide-types.c
index e4a4737..1843080 100644
--- a/tests/tests-c-compiler/check-src/check-30.-fwide-types.c
+++ b/tests/tests-c-compiler/check-src/check-30.-fwide-types.c
@@ -216,14 +216,11 @@
 
 static void
 try_corrupt(uint8_t *buf, size_t size) {
-	uint8_t *tmp;
-	int i;
+	uint8_t tmp[size];
 
 	fprintf(stderr, "\nCorrupting...\n");
 
-	tmp = alloca(size);
-
-	for(i = 0; i < 1000; i++) {
+	for(int i = 0; i < 1000; i++) {
 		int loc;
 		memcpy(tmp, buf, size);