diff --git a/git-compat-util.h b/git-compat-util.h
index bc8fc8cf85..71e3e13846 100644
--- a/git-compat-util.h
+++ b/git-compat-util.h
@@ -517,7 +517,7 @@ extern int git_lstat(const char *, struct stat *);
 #endif
 
 #define DEFAULT_PACKED_GIT_LIMIT \
-	((1024L * 1024L) * (sizeof(void*) >= 8 ? 8192 : 256))
+	((1024L * 1024L) * (size_t)(sizeof(void*) >= 8 ? 8192 : 256))
 
 #ifdef NO_PREAD
 #define pread git_pread