diff --git a/OLEDDisplayUi.h b/OLEDDisplayUi.h
index 617346a3a2ede21c9f09a19a279aa89d4cbe8387..35a1e99bcf449c3d2f5f4405f223949005fce497 100644
--- a/OLEDDisplayUi.h
+++ b/OLEDDisplayUi.h
@@ -72,7 +72,7 @@ const char ANIMATION_inactiveSymbol[] PROGMEM = {
 
 // Structure of the UiState
 struct OLEDDisplayUiState {
-  u_int64_t     lastUpdate                = 0;
+  uint64_t     lastUpdate                = 0;
   uint16_t      ticksSinceLastStateSwitch = 0;
 
   FrameState    frameState                = FIXED;