diff --git a/win32/configure.bat b/win32/configure.bat
index e9e63ac11d..79384a8759 100755
--- a/win32/configure.bat
+++ b/win32/configure.bat
@@ -240,8 +240,7 @@ goto :loop ;
 goto :loop ;
 :gmp
   echo>> %config_make% WITH_GMP = yes
-  echo>>%confargs%  %1=1 \
-  shift
+  echo>>%confargs%  %1 \
   shift
 goto :loop ;
 :gmp-dir