diff --git a/src/internfile/mh_xslt.cpp b/src/internfile/mh_xslt.cpp
index 867a5ac9..3b80fa2c 100644
--- a/src/internfile/mh_xslt.cpp
+++ b/src/internfile/mh_xslt.cpp
@@ -52,7 +52,9 @@ public:
 			// malloc_trim() and mallopt() doc seems to be a bit
 			// misleading, there is probably a frag size under which
 			// free() does not try to malloc_trim() at all
+#ifndef _WIN32
 			malloc_trim(0);
+#endif
         }
     }