diff --git a/tests/Makefile b/tests/Makefile
index 7b85888ed..93b5dc740 100644
--- a/tests/Makefile
+++ b/tests/Makefile
@@ -45,3 +45,5 @@ SRC = \
 HEADER = support/*.h tests/*.h
 
 include ../Makefile.target
+-include support/*.d
+-include tests/*.d