diff --git a/tests/mingw_convert_ctest.py b/tests/mingw_convert_ctest.py
index beee2166..2f6b0419 100644
--- a/tests/mingw_convert_ctest.py
+++ b/tests/mingw_convert_ctest.py
@@ -139,6 +139,9 @@ def processfile(infilename):
 
 	for line in lines:
 		debug('input:',line)
+
+		# special for CTestCustom.template + ctest bugs w arguments
+		line=line.replace('--builddir='+linbuild,'')
 		
 		line=line.replace(linbuild,winbuild)
 		line=line.replace(lintct,wintct)