diff --git a/src/generic/headerctrlg.cpp b/src/generic/headerctrlg.cpp
index 4bac640faa..8f2c919f08 100644
--- a/src/generic/headerctrlg.cpp
+++ b/src/generic/headerctrlg.cpp
@@ -204,6 +204,8 @@ unsigned int wxHeaderCtrl::FindColumnAtPoint(int x, bool *onSeparator) const
         }
     }
 
+    if ( onSeparator )
+        *onSeparator = false;
     return COL_NONE;
 }