diff --git a/include/mcl/op.hpp b/include/mcl/op.hpp
index a8b47e5..8011984 100644
--- a/include/mcl/op.hpp
+++ b/include/mcl/op.hpp
@@ -366,10 +366,11 @@ inline const char* getIoSeparator(int ioMode)
 	return (ioMode & (IoArray | IoArrayRaw | IoSerialize | IoSerializeHexStr)) ? "" : " ";
 }
 
-inline void dump(const char *s, size_t n)
+inline void dump(const void *buf, size_t n)
 {
+	const uint8_t *s = (const uint8_t *)buf;
 	for (size_t i = 0; i < n; i++) {
-		printf("%02x ", (uint8_t)s[i]);
+		printf("%02x ", s[i]);
 	}
 	printf("\n");
 }