diff --git a/Firmware/mmu.cpp b/Firmware/mmu.cpp
index a48ca36a..4db861de 100644
--- a/Firmware/mmu.cpp
+++ b/Firmware/mmu.cpp
@@ -28,7 +28,7 @@ bool mmu_enabled = false;
 
 bool mmu_ready = false;
 
-int8_t mmu_state = 0;
+static int8_t mmu_state = 0;
 
 uint8_t mmu_cmd = 0;
 
diff --git a/Firmware/mmu.h b/Firmware/mmu.h
index 763c15ea..63835ca8 100644
--- a/Firmware/mmu.h
+++ b/Firmware/mmu.h
@@ -5,8 +5,6 @@
 
 extern bool mmu_enabled;
 
-extern int8_t mmu_state;
-
 extern uint8_t mmu_extruder;
 
 extern uint8_t tmp_extruder;