diff --git a/src/common/cmdproc.cpp b/src/common/cmdproc.cpp
index 4534de633e..40c2023ba8 100644
--- a/src/common/cmdproc.cpp
+++ b/src/common/cmdproc.cpp
@@ -333,7 +333,7 @@ bool wxCommandProcessor::IsDirty() const
     {
         // We have never been saved, so we are dirty if and only if we have any
         // commands at all.
-        return m_currentCommand;
+        return m_currentCommand != NULL;
     }
 
     if ( !m_currentCommand )