diff --git a/rtgui/previewloader.cc b/rtgui/previewloader.cc
index 0c0ecf9f6..f4cfe2b1b 100644
--- a/rtgui/previewloader.cc
+++ b/rtgui/previewloader.cc
@@ -168,6 +168,10 @@ PreviewLoader::PreviewLoader():
 {
 }
 
+PreviewLoader::~PreviewLoader() {
+    delete impl_;
+}
+
 PreviewLoader* PreviewLoader::getInstance()
 {
     static PreviewLoader instance_;
diff --git a/rtgui/previewloader.h b/rtgui/previewloader.h
index 77091bcd3..311d9d5ce 100644
--- a/rtgui/previewloader.h
+++ b/rtgui/previewloader.h
@@ -82,6 +82,7 @@ public:
 private:
 
     PreviewLoader();
+    ~PreviewLoader();
 
     class Impl;
     Impl* impl_;
diff --git a/rtgui/thumbimageupdater.cc b/rtgui/thumbimageupdater.cc
index 992b38812..f7caf5f5e 100644
--- a/rtgui/thumbimageupdater.cc
+++ b/rtgui/thumbimageupdater.cc
@@ -183,6 +183,10 @@ ThumbImageUpdater::ThumbImageUpdater():
 {
 }
 
+ThumbImageUpdater::~ThumbImageUpdater() {
+    delete impl_;
+}
+
 void ThumbImageUpdater::add(ThumbBrowserEntryBase* tbe, bool* priority, bool upgrade, ThumbImageUpdateListener* l)
 {
     // nobody listening?
diff --git a/rtgui/thumbimageupdater.h b/rtgui/thumbimageupdater.h
index 820ddca8f..a3be44d7c 100644
--- a/rtgui/thumbimageupdater.h
+++ b/rtgui/thumbimageupdater.h
@@ -89,6 +89,7 @@ public:
 private:
 
     ThumbImageUpdater();
+    ~ThumbImageUpdater();
 
     class Impl;
     Impl* impl_;