diff --git a/Makefile.am b/Makefile.am
index 7dbe569..d0efa12 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -611,6 +611,7 @@ EXTRA_DIST += \
   testdata/grepinput \
   testdata/grepinput3 \
   testdata/grepinput8 \
+  testdata/grepinputM \
   testdata/grepinputv \
   testdata/grepinputx \
   testdata/greplist \