diff --git a/include/comphelper/errcode.hxx b/include/comphelper/errcode.hxx
index 547be70a13dd..884a7785f300 100644
--- a/include/comphelper/errcode.hxx
+++ b/include/comphelper/errcode.hxx
@@ -137,8 +137,8 @@ public:
     }
 
     /// Return a string suitable for debug output, the same as the operator<< function
-    UNLESS_MERGELIBS(COMPHELPER_DLLPUBLIC) OUString toString() const;
-    
+    COMPHELPER_DLLPUBLIC OUString toString() const;
+
     template <typename... Args> bool anyOf(Args... args) const
     {
         static_assert(sizeof...(args) > 0);