diff --git a/libraries/AP_RangeFinder/AP_RangeFinder_PX4.cpp b/libraries/AP_RangeFinder/AP_RangeFinder_PX4.cpp
index 9d29faf3b9..c68403ebb1 100644
--- a/libraries/AP_RangeFinder/AP_RangeFinder_PX4.cpp
+++ b/libraries/AP_RangeFinder/AP_RangeFinder_PX4.cpp
@@ -80,7 +80,6 @@ extern "C" {
     int ll40ls_main(int, char **);
     int trone_main(int, char **);
     int mb12xx_main(int, char **);
-    int pwm_input_main(int, char **);
 };
 
 /*