diff --git a/radio/src/pulses/modules.h b/radio/src/pulses/modules.h
index 31651a4ad..c2edea7f0 100644
--- a/radio/src/pulses/modules.h
+++ b/radio/src/pulses/modules.h
@@ -76,7 +76,7 @@ inline bool isModuleCrossfire(uint8_t idx)
 }
 #endif
 
-#if defined(EXTRA_MODULE)
+#if defined(PCBSKY9X)
 inline bool isExtraModule(uint8_t idx)
 {
   return idx == EXTRA_MODULE);