diff --git a/security/coreconf/headers.mk b/security/coreconf/headers.mk
index f09d5f6ee32b..63d60451092e 100644
--- a/security/coreconf/headers.mk
+++ b/security/coreconf/headers.mk
@@ -52,3 +52,11 @@ endif
 #
 
 INCLUDES += -I$(SOURCE_XPPRIVATE_DIR)
+
+#
+#  Mozilla WIN32 build exports headers to mozilla/dist/include
+#
+
+ifeq ($(MOZ_BITS),32)
+INCLUDES += -I$(SOURCE_XP_DIR)/include
+endif