diff --git a/appveyor.yml b/appveyor.yml
index 7e69119..424397a 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -67,9 +67,9 @@ build_script:
       ..
 
   - cmd: nmake install
-  - cmd: cp "%CONDA%\Library\bin\openjp2.dll" "%INSTALL_DIR%\bin\"
-  - cmd: cp "%CONDA%\Library\bin\libpng16.dll" "%INSTALL_DIR%\bin\"
-  - cmd: cp "%CONDA%\Library\bin\zlib.dll" "%INSTALL_DIR%\bin\"
+  - cmd: copy "%CONDA%\Library\bin\openjp2.dll" "%INSTALL_DIR%\bin\"
+  - cmd: copy "%CONDA%\Library\bin\libpng16.dll" "%INSTALL_DIR%\bin\"
+  - cmd: copy "%CONDA%\Library\bin\zlib.dll" "%INSTALL_DIR%\bin\"
 
 test_script:
   - cmd: call "%INSTALL_DIR%\bin\codes_info.exe"