diff --git a/package/libffi/libffi.mk b/package/libffi/libffi.mk
index 660a034787..5ada36d6f6 100644
--- a/package/libffi/libffi.mk
+++ b/package/libffi/libffi.mk
@@ -13,7 +13,8 @@ LIBFFI_INSTALL_STAGING = YES
 # accordingly
 define LIBFFI_MOVE_STAGING_HEADERS
 	mv $(STAGING_DIR)/usr/lib/libffi-*/include/*.h $(STAGING_DIR)/usr/include/
-	sed -i '/^includedir.*/d' $(STAGING_DIR)/usr/lib/pkgconfig/libffi.pc
+	$(SED) '/^includedir.*/d' $(STAGING_DIR)/usr/lib/pkgconfig/libffi.pc
+	$(SED) '/^Cflags:.*/d' $(STAGING_DIR)/usr/lib/pkgconfig/libffi.pc
 	rm -rf $(TARGET_DIR)/usr/lib/libffi-*
 endef
 
@@ -23,7 +24,8 @@ LIBFFI_POST_INSTALL_STAGING_HOOKS += LIBFFI_MOVE_STAGING_HEADERS
 define LIBFFI_MOVE_TARGET_HEADERS
 	install -d $(TARGET_DIR)/usr/include/
 	mv $(TARGET_DIR)/usr/lib/libffi-*/include/*.h $(TARGET_DIR)/usr/include/
-	sed -i '/^includedir.*/d' $(TARGET_DIR)/usr/lib/pkgconfig/libffi.pc
+	$(SED) '/^includedir.*/d' $(STAGING_DIR)/usr/lib/pkgconfig/libffi.pc
+	$(SED) '/^Cflags:.*/d' $(STAGING_DIR)/usr/lib/pkgconfig/libffi.pc
 	rm -rf $(TARGET_DIR)/usr/lib/libffi-*
 endef