diff --git a/Makefile b/Makefile
index e2a2ebe..e8a138e 100644
--- a/Makefile
+++ b/Makefile
@@ -188,7 +188,7 @@ libesphttpd/Makefile:
 	$(Q) git submodule update
 
 libesphttpd: libesphttpd/Makefile
-	$(Q) make -C libesphttpd
+	$(Q) make -C libesphttpd USE_OPENSDK=$(USE_OPENSDK)
 
 $(APP_AR): libesphttpd $(OBJ)
 	$(vecho) "AR $@"