diff --git a/lib/cgo/tests/testutils/libsky_assert.c b/lib/cgo/tests/testutils/libsky_assert.c
index aaa3ecca1..d41cc44c9 100644
--- a/lib/cgo/tests/testutils/libsky_assert.c
+++ b/lib/cgo/tests/testutils/libsky_assert.c
@@ -58,13 +58,14 @@ GoInt_ isSigEq(cipher__Sig *sig1, cipher__Sig *sig2) {
   return memcmp((void *)sig1, (void *)sig2, sizeof(cipher__Sig)) == 0;
 }
 
-GoInt_ isU8Eq(unsigned char p1[], unsigned char p2[], size_t len) {
-
-  if (strncmp(p1, p2, len) == 0) {
-    
+GoInt_ isU8Eq(unsigned char p1[], unsigned char p2[], size_t len)
+{
+    for (GoInt i = 0; i < len; i++) {
+        if (p1[i] != p2[i]) {
+            return 0;
+        }
+    }
     return 1;
-  }
-  return 0;
 }
 
 GoInt_ isSHA256Eq(cipher__SHA256 *sh1, cipher__SHA256 *sh2) {