diff --git a/firmware/export/adc.h b/firmware/export/adc.h
index e2c87fa385..442702d097 100644
--- a/firmware/export/adc.h
+++ b/firmware/export/adc.h
@@ -72,4 +72,8 @@
 unsigned short adc_read(int channel);
 void adc_init(void);
 
+#ifdef IRIVER_H100
+unsigned char adc_scan(int channel)
+#endif
+
 #endif