--- a/Makefile.am
+++ b/Makefile.am
@@ -11,8 +11,7 @@
   helpers     \
   m4macros    \
   scripts     \
-  xdt-csource \
-  tests
+  xdt-csource
 
 distclean-local:
 	rm -rf *.cache *~
--- a/Makefile.in
+++ b/Makefile.in
@@ -340,8 +340,7 @@
   helpers     \
   m4macros    \
   scripts     \
-  xdt-csource \
-  tests
+  xdt-csource
 
 EXTRA_DIST = \
 	HACKING \
