diff --git a/radio/src/thirdparty/libopenui/src/memcpy.h b/radio/src/thirdparty/libopenui/src/memcpy.h
index 10ff167df..21aaf1417 100644
--- a/radio/src/thirdparty/libopenui/src/memcpy.h
+++ b/radio/src/thirdparty/libopenui/src/memcpy.h
@@ -27,7 +27,7 @@
 inline void safeMemcpy(void * dest, const void * src, unsigned int size)
 {
   if (((uint32_t)dest & 0x03) || ((uint32_t)src & 0x03)) {
-    for (int i = 0; i < size; i++) {
+    for (unsigned i = 0; i < size; i++) {
       ((uint8_t *)dest)[i] = ((uint8_t *)src)[i];
     }
   }