diff --git a/libraries/AP_CustomRotations/AP_CustomRotations.cpp b/libraries/AP_CustomRotations/AP_CustomRotations.cpp
index 5123ab0b6a..0af266ea1f 100644
--- a/libraries/AP_CustomRotations/AP_CustomRotations.cpp
+++ b/libraries/AP_CustomRotations/AP_CustomRotations.cpp
@@ -28,7 +28,7 @@ const AP_Param::GroupInfo AP_CustomRotations::var_info[] = {
     AP_GROUPEND
 };
 
-AP_CustomRotation::AP_CustomRotation(AP_CustomRotation_params _params):
+AP_CustomRotation::AP_CustomRotation(AP_CustomRotation_params &_params):
     params(_params)
 {
     init();
diff --git a/libraries/AP_CustomRotations/AP_CustomRotations.h b/libraries/AP_CustomRotations/AP_CustomRotations.h
index 9f25d14a19..f26c43b710 100644
--- a/libraries/AP_CustomRotations/AP_CustomRotations.h
+++ b/libraries/AP_CustomRotations/AP_CustomRotations.h
@@ -32,7 +32,7 @@ public:
 
 class AP_CustomRotation {
 public:
-    AP_CustomRotation(AP_CustomRotation_params _params);
+    AP_CustomRotation(AP_CustomRotation_params &_params);
 
     void init();