diff --git a/Functions.ino b/Functions.ino
index 0c107c8..6ca5960 100644
--- a/Functions.ino
+++ b/Functions.ino
@@ -21,7 +21,7 @@ void makeComInterface(){
 
 void queryPen() {
 	char state;
-	if (penState=penUpPos)
+	if (penState==penUpPos)
 		state='1';
 	else
 		state='0';