diff --git a/src/msgPrintControl.cpp b/src/msgPrintControl.cpp
index ae825e5..24b714b 100644
--- a/src/msgPrintControl.cpp
+++ b/src/msgPrintControl.cpp
@@ -20,6 +20,8 @@ void msgPrintControlKey::format(char *buffer, size_t bufferSize) {
 
 // =============================================================================
 
+msgPrintControl::~msgPrintControl() = default;
+
 bool msgPrintControl::shouldBePrinted(msgPrintControlKey &key, bool wantToPrint,
                                       asynUser *pasynUser) {
 
diff --git a/src/msgPrintControl.h b/src/msgPrintControl.h
index 36548bd..a228f8e 100644
--- a/src/msgPrintControl.h
+++ b/src/msgPrintControl.h
@@ -84,6 +84,12 @@ template <> struct hash<msgPrintControlKey> {
  */
 class msgPrintControl {
   public:
+    /**
+     * @brief Destroy the msgPrintControl object
+     *
+     */
+    ~msgPrintControl();
+
     /**
      * @brief Checks if the error message associated with "key" has been printed
      * more than `this->maxRepetitions_` times in a row. If yes, returns false,
diff --git a/src/sinqAxis.cpp b/src/sinqAxis.cpp
index e61e768..9256704 100644
--- a/src/sinqAxis.cpp
+++ b/src/sinqAxis.cpp
@@ -337,6 +337,8 @@ sinqAxis::sinqAxis(class sinqController *pC, int axisNo)
     }
 }
 
+sinqAxis::~sinqAxis() = default;
+
 asynStatus sinqAxis::poll(bool *moving) {
 
     // Local variable declaration
diff --git a/src/sinqAxis.h b/src/sinqAxis.h
index c9284f9..7d254c8 100644
--- a/src/sinqAxis.h
+++ b/src/sinqAxis.h
@@ -24,6 +24,13 @@ class epicsShareClass sinqAxis : public asynMotorAxis {
      */
     sinqAxis(class sinqController *pC_, int axisNo);
 
+    /**
+     * @brief Destroy the sinqAxis object
+     *
+     * This destructor is necessary in order to use the PIMPL idiom.
+     */
+    ~sinqAxis();
+
     /**
      * @brief Perform some standardized operations before and after the concrete
     `doPoll` implementation.