diff --git a/src/turboPmacAxis.h b/src/turboPmacAxis.h
index 932de99..ea215bc 100644
--- a/src/turboPmacAxis.h
+++ b/src/turboPmacAxis.h
@@ -24,6 +24,7 @@ class turboPmacAxis : public sinqAxis {
     /**
      * @brief Destroy the turboPmacAxis
      *
+     * This destructor is necessary in order to use the PIMPL idiom.
      */
     virtual ~turboPmacAxis();
 
diff --git a/src/turboPmacController.cpp b/src/turboPmacController.cpp
index 25342b1..f431f3f 100644
--- a/src/turboPmacController.cpp
+++ b/src/turboPmacController.cpp
@@ -179,7 +179,7 @@ turboPmacController::turboPmacController(const char *portName,
     }
 }
 
-turboPmacController::~turboPmacController(void) {}
+turboPmacController::~turboPmacController() {}
 
 /*
 Access one of the axes of the controller via the axis adress stored in asynUser.
diff --git a/src/turboPmacController.h b/src/turboPmacController.h
index b3a7fbb..a886539 100644
--- a/src/turboPmacController.h
+++ b/src/turboPmacController.h
@@ -41,7 +41,7 @@ class turboPmacController : public sinqController {
      * destructor needs to be provided for handling turboPmacControllerImpl.
      *
      */
-    ~turboPmacController(void) {}
+    virtual ~turboPmacController();
 
     /**
      * @brief Get the axis object