diff --git a/dlls/msvcrt/file.c b/dlls/msvcrt/file.c
index 2e473a90ac8..f803f5d9ddb 100644
--- a/dlls/msvcrt/file.c
+++ b/dlls/msvcrt/file.c
@@ -4254,7 +4254,7 @@ MSVCRT_size_t CDECL MSVCRT__fread_nolock_s(void *buf, MSVCRT_size_t buf_size, MS
             if(c == EOF)
                 break;
 
-            if(!MSVCRT_CHECK_PMT_ERR(buf_size-buf_pos > 0, MSVCRT_ERANGE)) {
+            if(!MSVCRT_CHECK_PMT_ERR(buf_size != buf_pos, MSVCRT_ERANGE)) {
                 memset(buf, 0, buf_size);
                 return 0;
             }