diff --git a/stk500v2/main.cpp b/stk500v2/main.cpp
index 77fbeec..57d1a6c 100644
--- a/stk500v2/main.cpp
+++ b/stk500v2/main.cpp
@@ -506,10 +506,10 @@ static inline void formatErrorAnswer(Message &msg)
 }
 
 enum class ChipEraseState {
-	NONE = 0b00,
-	REQUEST = 0b01,
-	RESPONSE = 0b10,
-	PERFORM = 0b11,
+	NONE = 0,
+	REQUEST = (1 << 1),
+	RESPONSE = (1 << 2),
+	PERFORM = REQUEST | RESPONSE,
 };
 
 constexpr ChipEraseState operator|(const ChipEraseState &self, const ChipEraseState &other)