1 files changed, 1 insertions, 1 deletions

diff --git a/include/plist/Boolean.h b/include/plist/Boolean.h
index 307a1ff..9ecbc48 100644
--- a/include/plist/Boolean.h
+++ b/include/plist/Boolean.h
@@ -33,7 +33,7 @@ public :
     Boolean(Node* parent = NULL);
     Boolean(plist_t node, Node* parent = NULL);
     Boolean(const Boolean& b);
-    Boolean& operator=(Boolean& b);
+    Boolean& operator=(const Boolean& b);
     Boolean(bool b);
     virtual ~Boolean();