diff --git a/tools/mapmerge/Prepare Maps.bat b/tools/mapmerge/Prepare Maps.bat
index 89e5a233ed2..c4f06b2feb6 100644
--- a/tools/mapmerge/Prepare Maps.bat	
+++ b/tools/mapmerge/Prepare Maps.bat	
@@ -1,7 +1,7 @@
 @echo off
 cd ../../_maps/map_files/
 
-for /R %%f in (*.dmm) do copy %%f "%%f.backup"
+for /R %%f in (*.dmm) do copy "%%f" "%%f.backup"
 
 cls
 echo All dmm files in map_files directories have been backed up