diff --git a/Firmware/mmu.cpp b/Firmware/mmu.cpp
index 783564329..0c1279964 100644
--- a/Firmware/mmu.cpp
+++ b/Firmware/mmu.cpp
@@ -965,7 +965,7 @@ void display_loading()
 	}
 }
 
-void extr_adj(int extruder) //loading filament for SNMM
+void extr_adj(uint8_t extruder) //loading filament for SNMM
 {
 #ifndef SNMM
     MmuCmd cmd = MmuCmd::L0 + extruder;
diff --git a/Firmware/mmu.h b/Firmware/mmu.h
index a7da0c2d9..0f8784ba7 100644
--- a/Firmware/mmu.h
+++ b/Firmware/mmu.h
@@ -103,7 +103,7 @@ extern void extr_mov(float shift, float feed_rate);
 extern void change_extr(int extr);
 extern int get_ext_nr();
 extern void display_loading();
-extern void extr_adj(int extruder);
+extern void extr_adj(uint8_t extruder);
 extern void extr_unload();
 //-//
 extern void extr_unload_();
diff --git a/Firmware/ultralcd.h b/Firmware/ultralcd.h
index 84988c588..365f17977 100644
--- a/Firmware/ultralcd.h
+++ b/Firmware/ultralcd.h
@@ -129,7 +129,6 @@ void lcd_commands();
 
 
 void change_extr(int extr);
-void extr_adj(int extruder);
 
 #ifdef SNMM
 void extr_unload_all();