diff --git a/GNUmakefile.gcc_plugin b/GNUmakefile.gcc_plugin
index bf3a3288..3f658a47 100644
--- a/GNUmakefile.gcc_plugin
+++ b/GNUmakefile.gcc_plugin
@@ -19,7 +19,7 @@
 #
 #   http://www.apache.org/licenses/LICENSE-2.0
 #
-
+#TEST_MMAP=1
 PREFIX      ?= /usr/local
 HELPER_PATH ?= $(PREFIX)/lib/afl
 BIN_PATH    ?= $(PREFIX)/bin