diff --git a/src/Fl_Image_Reader.h b/src/Fl_Image_Reader.h
index 2c62e4a27..e9b2937b2 100644
--- a/src/Fl_Image_Reader.h
+++ b/src/Fl_Image_Reader.h
@@ -80,7 +80,7 @@ public:
   }
 
   // return the name or filename for this reader
-  const char *name() { return pName; }
+  const char *name() const { return pName; }
 
   // skip a given number of bytes
   void skip(unsigned int n) { seek(tell() + n); }