1 files changed, 1 insertions, 1 deletions
diff --git a/extpipe.h b/extpipe.h
index 09f9948..8df5356 100644
--- a/extpipe.h
+++ b/extpipe.h
@@ -12,7 +12,7 @@ private:
 public:
     cExtPipe(void);
     ~cExtPipe();
-    operator FILE* ()
+    operator FILE* () const
     {
         return f;
     }