diff --git a/libraries/FSTools/FSTools.cpp b/libraries/FSTools/FSTools.cpp
index d71fe1cb2..33f6b40b7 100644
--- a/libraries/FSTools/FSTools.cpp
+++ b/libraries/FSTools/FSTools.cpp
@@ -1,7 +1,7 @@
 #include "FSTools.h"
 #include "LittleFS.h"
 #include <spiffs_api.h>
-#include <ESP.h>
+#include <Esp.h>
 
 
 namespace FST {