diff --git a/Scripts/developer_scripts/autotest_cgal b/Scripts/developer_scripts/autotest_cgal
index ce4cf750475..b3bac6717f9 100755
--- a/Scripts/developer_scripts/autotest_cgal
+++ b/Scripts/developer_scripts/autotest_cgal
@@ -514,7 +514,12 @@ if [ -z "\$CMAKE_GENERATOR" ]; then
   CMAKE_GENERATOR='${CMAKE_GENERATOR}';
 fi
 MAKE_CMD='${MAKE_CMD}';
-CGAL_REFERENCE_CACHE_DIR='${CGAL_REFERENCE_CACHE_DIR}';
+if [ -n "${IS_CYGWIN}" ]; then
+  CGAL_REFERENCE_CACHE_DIR=\$( cygpath -w '${CGAL_REFERENCE_CACHE_DIR}' );
+else
+  CGAL_REFERENCE_CACHE_DIR='${CGAL_REFERENCE_CACHE_DIR}';\
+fi
+
 export CMAKE_GENERATOR;
 export MAKE_CMD;
 export CGAL_BINARY_DIR;