diff --git a/test/refcount_ptr_test.cpp b/test/refcount_ptr_test.cpp
index 297450d..58cadd3 100644
--- a/test/refcount_ptr_test.cpp
+++ b/test/refcount_ptr_test.cpp
@@ -42,7 +42,7 @@ test_type
     test_type( test_type const & );
     test_type & operator=( test_type const & );
 
-    mutable int & count_;
+    int & count_;
     };
 
 int