diff --git a/firmware/controllers/sensors/impl/software_knock.cpp b/firmware/controllers/sensors/impl/software_knock.cpp
index 24c54874e1..42247a1010 100644
--- a/firmware/controllers/sensors/impl/software_knock.cpp
+++ b/firmware/controllers/sensors/impl/software_knock.cpp
@@ -90,7 +90,7 @@ static const ADCConversionGroup adcConvGroupCh2 = { FALSE, 1, &completionCallbac
 };
 #endif // KNOCK_HAS_CH2
 
-const ADCConversionGroup* getConversionGroup(uint8_t channelIdx) {
+static const ADCConversionGroup* getConversionGroup(uint8_t channelIdx) {
 #if KNOCK_HAS_CH2
 	if (channelIdx == 1) {
 		return &adcConvGroupCh2;