diff --git a/firmware/export/adc.h b/firmware/export/adc.h
index 18b0c3d578..7a90afd9b5 100644
--- a/firmware/export/adc.h
+++ b/firmware/export/adc.h
@@ -82,7 +82,7 @@ unsigned char adc_scan(int channel);
 unsigned short adc_read(int channel);
 void adc_init(void);
 
-#ifdef IRIVER_H120
+#ifdef IRIVER_H100_SERIES
 unsigned char adc_scan(int channel);
 #endif