diff --git a/configure b/configure
index 4e6c8d85b8..7c0a787ea1 100755
--- a/configure
+++ b/configure
@@ -305,6 +305,8 @@ if test "$gcc" -eq 1 && ($cc -c $test.c) >> configure.log 2>&1; then
         echo "If this doesn't work for you, try win32/Makefile.gcc." | tee -a configure.log
         LDSHARED=${LDSHARED-"$cc -shared"}
         LDSHAREDLIBC=""
+        shared_ext='.dll'
+        SHAREDLIB='libz.dll'
         EXE='.exe' ;;
   QNX*) # This is for QNX6. I suppose that the QNX rule below is for QNX2,QNX4
         # (alain.bonnefoy@icbt.com)