diff --git a/test_multiaddr.h b/test_multiaddr.h
index 7c5c134..90863c3 100644
--- a/test_multiaddr.h
+++ b/test_multiaddr.h
@@ -167,7 +167,7 @@ int test_multiaddr_peer_id() {
 	bytes = NULL;
 
 	// 2. Display the resultant bytes
-	result = Var_To_Hex((char*)addr2->bytes, addr2->bsize);
+	result = (char*)Var_To_Hex((char*)addr2->bytes, addr2->bsize);
 	fprintf(stderr, "New      Bytes: %s\n", result);
 	free(result);
 	result = NULL;
diff --git a/varhexutils.c b/varhexutils.c
index 1915e0e..7c7dce0 100644
--- a/varhexutils.c
+++ b/varhexutils.c
@@ -103,7 +103,7 @@ void vthconvert(const unsigned char* in, int in_size, unsigned char** out)
 	unsigned char *ptr = *out;
 
 	for (int i = 0; i < in_size; i++) {
-		sprintf(&ptr[i * 2], "%02x", in[i]);
+		sprintf((char*)&ptr[i * 2], "%02x", in[i]);
 	}
 }