diff --git a/applypatch/applypatch.cpp b/applypatch/applypatch.cpp
index c8594c2..270fde5 100644
--- a/applypatch/applypatch.cpp
+++ b/applypatch/applypatch.cpp
@@ -596,7 +596,7 @@
 
 int CacheSizeCheck(size_t bytes) {
     if (MakeFreeSpaceOnCache(bytes) < 0) {
-        printf("unable to make %ld bytes available on /cache\n", (long)bytes);
+        printf("unable to make %zu bytes available on /cache\n", bytes);
         return 1;
     } else {
         return 0;