1 files changed, 2 insertions, 2 deletions
diff --git a/starmath/inc/action.hxx b/starmath/inc/action.hxx
index 6684a7461e95..cde1e0ce3b47 100644
--- a/starmath/inc/action.hxx
+++ b/starmath/inc/action.hxx
@@ -28,8 +28,8 @@ class SmDocShell;
 class SmFormatAction: public SfxUndoAction
 {
     SmDocShell  *pDoc;
-    SmFormat    aOldFormat;
-    SmFormat    aNewFormat;
+    SmFormat const    aOldFormat;
+    SmFormat const    aNewFormat;
 
 public:
     SmFormatAction(SmDocShell *pDocSh, const SmFormat& rOldFormat, const SmFormat& rNewFormat);