diff --git a/radio/src/targets/common/arm/stm32/adc_driver.cpp b/radio/src/targets/common/arm/stm32/adc_driver.cpp
index a40481802..6b21ec03d 100644
--- a/radio/src/targets/common/arm/stm32/adc_driver.cpp
+++ b/radio/src/targets/common/arm/stm32/adc_driver.cpp
@@ -44,6 +44,8 @@
   const int8_t ana_direction[NUM_ANALOGS] = {1,-1,-1,1,  -1,1,  1};
 #elif defined(REV4a)
   const int8_t ana_direction[NUM_ANALOGS] = {1,-1,1,-1,  1,-1,0,  1,1,  1};
+#else
+  const int8_t ana_direction[NUM_ANALOGS] = {1,-1,1,-1,  1,1,0,   1,1,  1};
 #endif
 
 #if NUM_PWMSTICKS > 0