diff --git a/reactos/base/applications/mspaint/winproc.c b/reactos/base/applications/mspaint/winproc.c
index cdb2a6cd6ad..3ae93a5a5af 100644
--- a/reactos/base/applications/mspaint/winproc.c
+++ b/reactos/base/applications/mspaint/winproc.c
@@ -210,7 +210,7 @@ WindowProcedure(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
             TCHAR droppedfile[MAX_PATH];
             HBITMAP bmNew = NULL;
             drophandle = (HDROP)wParam;
-            DragQueryFile(drophandle, 0, droppedfile, sizeof(droppedfile));
+            DragQueryFile(drophandle, 0, droppedfile, SIZEOF(droppedfile));
             DragFinish(drophandle);
             LoadDIBFromFile(&bmNew, droppedfile, &fileTime, &fileSize, &fileHPPM, &fileVPPM);
             if (bmNew != NULL)