diff --git a/src/common/imagxpm.cpp b/src/common/imagxpm.cpp
index 07f8ba9750..b8996eaafe 100644
--- a/src/common/imagxpm.cpp
+++ b/src/common/imagxpm.cpp
@@ -141,6 +141,7 @@ bool wxXPMHandler::SaveFile(wxImage * image,
 
     // 3. create color symbols table:
     wxHashTable table(wxKEY_INTEGER);
+    table.DeleteContents(TRUE);    
     image->ComputeHistogram(table);
 
     char *symbols_data = new char[cols * (chars_per_pixel+1)];