1 files changed, 2 insertions, 2 deletions

diff --git a/src/sptr.h b/src/sptr.h
index deae94d..23c21dc 100644
--- a/src/sptr.h
+++ b/src/sptr.h
@@ -65,12 +65,12 @@ public:
                 return pData == src.pData;
         }
 
-        operator bool()
+        operator bool() const
         {
                 return pRefCnt != NULL;
         }
 
-        bool isSet()
+        bool isSet() const
         {
                 return pRefCnt != NULL;
         }