diff --git a/src/open9x.h b/src/open9x.h
index ff5bf0f7b..4056de6d9 100644
--- a/src/open9x.h
+++ b/src/open9x.h
@@ -514,6 +514,9 @@ extern void setTrimValue(uint8_t phase, uint8_t idx, int16_t trim);
 
 #if defined(PCBV4)
 extern uint8_t s_perOut_flight_phase;
+#endif
+
+#if define(ROTARY_ENCODERS)
 int16_t getRotaryEncoder(uint8_t idx);
 void incRotaryEncoder(uint8_t idx, int8_t inc);
 inline bool navigationRotaryEncoder(uint8_t event)