diff --git a/Makefile.am b/Makefile.am
index 41656da8e0e6960ff37af9aa22c05d3b59b4dec7..445f4c2f0d44b2fbce5df0f3a073a794b5eb10db 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -8,7 +8,8 @@ EXTRA_DIST=config/default \
 	src/cfortran.doc \
 	util/sunf95preproc-wrapper \
 	util/sxpreproc-wrapper \
-	util/xlfpreproc-wrapper
+	util/xlfpreproc-wrapper \
+	config/interface.rb
 #
 ACLOCAL_AMFLAGS = -I m4
 #
diff --git a/Makefile.in b/Makefile.in
index e49e4a6198601a2daea26001beec2cc11dbd0d0e..61ee777f6a024a8da432698f445f0b7066a42e24 100644
--- a/Makefile.in
+++ b/Makefile.in
@@ -323,7 +323,8 @@ EXTRA_DIST = config/default \
 	src/cfortran.doc \
 	util/sunf95preproc-wrapper \
 	util/sxpreproc-wrapper \
-	util/xlfpreproc-wrapper
+	util/xlfpreproc-wrapper \
+	config/interface.rb
 
 #
 ACLOCAL_AMFLAGS = -I m4