diff --git a/mozilla/Makefile b/mozilla/Makefile
index 39c1eb359ac..df9de2116f9 100644
--- a/mozilla/Makefile
+++ b/mozilla/Makefile
@@ -41,6 +41,8 @@ ifndef NO_SECURITY
 DIRS		+= security
 endif
 
+DIRS		+= perf
+
 ifdef MOZ_PRIVACY
 DIRS		+= privacy
 endif