diff --git a/terminal/master/src/main.cpp b/terminal/master/src/main.cpp
index f96b8f7..a124577 100644
--- a/terminal/master/src/main.cpp
+++ b/terminal/master/src/main.cpp
@@ -37,8 +37,8 @@ void openDrawer(uint8_t index)
 const int encoderPinA = A1;
 const int encoderPinB = A2;
 const int stepsPerClick = 500;
-long encoderPostion = 0;
-uint8_t lastState;
+volatile long encoderPostion = 0;
+volatile uint8_t lastState;
 long lastClickPosition = 0;
 uint8_t selectedIndex = 0;
 void setupEncoder()