diff --git a/firmware/common/tuning.c b/firmware/common/tuning.c
index 651c8bb9..6bbe4cd1 100644
--- a/firmware/common/tuning.c
+++ b/firmware/common/tuning.c
@@ -24,6 +24,7 @@
 
 #include <rffc5071.h>
 #include <max2837.h>
+#include <sgpio.h>
 
 #define FREQ_ONE_MHZ     (1000*1000)