diff --git a/libkeke_array.c b/libkeke_array.c
index f304787..204be33 100644
--- a/libkeke_array.c
+++ b/libkeke_array.c
@@ -190,8 +190,8 @@ int compar(const void *a, const void *b, void *size_v) {
 #if defined(__BYTE_ORDER__)&&(__BYTE_ORDER__ == __ORDER_BIG_ENDIAN__)
 	return memcmp(a, b, size);
 #else
-	const unsigned char *aa = a;
-	const unsigned char *bb = b;
+	const signed char *aa = a;
+	const signed char *bb = b;
 	for(size_t i = 0; i < size; ++i) {
 		size_t s = size - i - 1;
 		if(aa[s] != bb[s]) return aa[s] - bb[s];