diff --git a/tests/Makefile b/tests/Makefile
index 0f429da23..7b85888ed 100644
--- a/tests/Makefile
+++ b/tests/Makefile
@@ -1,6 +1,7 @@
-# $Id$
 include ../Makefile.inc
 
+GTEST_ROOT = ../vendor/googletest
+
 PROGRAM = run
 
 LIBS += -L../libaegisub -laegisub -L../vendor/universalchardet -luniversalchardet $(LIBS_BOOST) $(LIBS_ICU)