diff --git a/mozilla/security/coreconf/headers.mk b/mozilla/security/coreconf/headers.mk
index 76f2d1483de..11da5852544 100644
--- a/mozilla/security/coreconf/headers.mk
+++ b/mozilla/security/coreconf/headers.mk
@@ -54,5 +54,5 @@ endif
 INCLUDES += -I$(SOURCE_XPPRIVATE_DIR)
 
 ifdef MOZILLA_CLIENT
-INCLUDES += -I$(SOURCE_XP_DIR)/include
+INCLUDES += $(MOZILLA_INCLUDES)
 endif