diff --git a/core/src/utils/proto/rigctl.cpp b/core/src/utils/proto/rigctl.cpp
index 33d11a7a..ff1694b3 100644
--- a/core/src/utils/proto/rigctl.cpp
+++ b/core/src/utils/proto/rigctl.cpp
@@ -1,4 +1,5 @@
 #include "rigctl.h"
+#include <math.h>
 
 namespace net::rigctl {
     Client::Client(std::shared_ptr<Socket> sock) {
@@ -315,4 +316,4 @@ namespace net::rigctl {
         sprintf(buf, "%lf\n", value);
         sock->sendstr(buf);
     }
-}
\ No newline at end of file
+}