diff --git a/sinqMotor b/sinqMotor
index c65a8de..8689c79 160000
--- a/sinqMotor
+++ b/sinqMotor
@@ -1 +1 @@
-Subproject commit c65a8de5ddddb516bab1c86cf8b286c1d84d5b22
+Subproject commit 8689c79f19a5a7b3522868d8bf353f8a1ceb41ea
diff --git a/src/masterMacsAxis.h b/src/masterMacsAxis.h
index 8789f72..b63d5fd 100644
--- a/src/masterMacsAxis.h
+++ b/src/masterMacsAxis.h
@@ -4,9 +4,9 @@
 #include "sinqAxis.h"
 #include <memory>
 
-struct masterMacsAxisImpl;
+struct HIDDEN masterMacsAxisImpl;
 
-class masterMacsAxis : public sinqAxis {
+class HIDDEN masterMacsAxis : public sinqAxis {
   public:
     /**
      * @brief Construct a new masterMacsAxis
diff --git a/src/masterMacsController.h b/src/masterMacsController.h
index 9b7818c..0d1ee52 100644
--- a/src/masterMacsController.h
+++ b/src/masterMacsController.h
@@ -15,11 +15,11 @@
 // Forward declaration of the controller class to resolve the cyclic dependency
 // between the controller and the axis .h-file. See
 // https://en.cppreference.com/w/cpp/language/class.
-class masterMacsAxis;
+class HIDDEN masterMacsAxis;
 
-struct masterMacsControllerImpl;
+struct HIDDEN masterMacsControllerImpl;
 
-class masterMacsController : public sinqController {
+class HIDDEN masterMacsController : public sinqController {
 
   public:
     /**