1 files changed, 6 insertions, 0 deletions
diff --git a/sd/source/ui/slidesorter/cache/SlsBitmapCompressor.hxx b/sd/source/ui/slidesorter/cache/SlsBitmapCompressor.hxx
index d1b67da6ebc3..a8fe6aa69521 100644
--- a/sd/source/ui/slidesorter/cache/SlsBitmapCompressor.hxx
+++ b/sd/source/ui/slidesorter/cache/SlsBitmapCompressor.hxx
@@ -66,6 +66,9 @@ public:
         the returned bitmap as is or if a new preview has to be created.
     */
     virtual bool IsLossless (void) const = 0;
+
+protected:
+    ~BitmapCompressor() {}
 };
 
 
@@ -78,6 +81,9 @@ class BitmapReplacement
 {
 public:
     virtual sal_Int32 GetMemorySize (void) const { return 0; }
+
+protected:
+    ~BitmapReplacement() {}
 };