diff --git a/Platformio/src/applicationInternal/gui/guiMemoryOptimizer.cpp b/Platformio/src/applicationInternal/gui/guiMemoryOptimizer.cpp
index bf77aa57..8c03a70f 100644
--- a/Platformio/src/applicationInternal/gui/guiMemoryOptimizer.cpp
+++ b/Platformio/src/applicationInternal/gui/guiMemoryOptimizer.cpp
@@ -13,7 +13,7 @@ tab_in_memory tabs_in_memory[3] = {{NULL, -1, ""}, {NULL, -1, ""}, {NULL, -1, ""
 // holds the ids of the tabs we had in memory before, so that we can determine the next or previous id
 int tabs_in_memory_previous_listIndex[3]= {-1 , -1, -1};
 
-bool gui_memoryOptimizer_isTabIDInMemory(u_int8_t tabID) {
+bool gui_memoryOptimizer_isTabIDInMemory(int tabID) {
   // range check
   if ((tabID < 0) || (tabID >= 3)) {
     return false;
diff --git a/Platformio/src/applicationInternal/gui/guiMemoryOptimizer.h b/Platformio/src/applicationInternal/gui/guiMemoryOptimizer.h
index fdd688e4..83a87c49 100644
--- a/Platformio/src/applicationInternal/gui/guiMemoryOptimizer.h
+++ b/Platformio/src/applicationInternal/gui/guiMemoryOptimizer.h
@@ -2,5 +2,5 @@
 
 void gui_memoryOptimizer_prepare_startup();
 void gui_memoryOptimizer_doAfterSliding_deletionAndCreation(lv_obj_t** tabview, int oldTabID, int newTabID, bool newGuiList, lv_obj_t** panel, lv_obj_t** img1, lv_obj_t** img2);
-bool gui_memoryOptimizer_isTabIDInMemory(u_int8_t tabID);
+bool gui_memoryOptimizer_isTabIDInMemory(int tabID);
 bool gui_memoryOptimizer_isGUInameInMemory(std::string guiName);