diff --git a/Makefile.inc1 b/Makefile.inc1
index e4eed287f9c6..f0fa94961708 100644
--- a/Makefile.inc1
+++ b/Makefile.inc1
@@ -823,7 +823,7 @@ EXTRA_DISTRIBUTIONS+=	tests
 
 DEBUG_DISTRIBUTIONS=
 .if ${MK_DEBUG_FILES} != "no"
-DEBUG_DISTRIBUTIONS+=	base ${EXTRA_DISTRIBUTIONS:S,doc,,}
+DEBUG_DISTRIBUTIONS+=	base ${EXTRA_DISTRIBUTIONS:S,doc,,:S,tests,,}
 .endif
 
 MTREE_MAGIC?=	mtree 2.0