t7006: modernize calls to unset

diff --git a/t/Makefile b/t/Makefile
index 47cbeb6e68ec910a691f2feca18b7b160efd0ced..9046ec98164f44811b67124e869353db4050ec06 100644 (file)
--- a/t/Makefile
+++ b/t/Makefile
@@ -71,7 +71,7 @@ gitweb-test:
        $(MAKE) $(TGITWEB)
 
 valgrind:
-       GIT_TEST_OPTS=--valgrind $(MAKE)
+       $(MAKE) GIT_TEST_OPTS="$(GIT_TEST_OPTS) --valgrind"
 
 # Smoke testing targets
 -include ../GIT-VERSION-FILE