diff --git a/src/SMESHGUI/SMESHGUI_HypothesesUtils.h b/src/SMESHGUI/SMESHGUI_HypothesesUtils.h
index 319e329ff..8768e0711 100644
--- a/src/SMESHGUI/SMESHGUI_HypothesesUtils.h
+++ b/src/SMESHGUI/SMESHGUI_HypothesesUtils.h
@@ -120,7 +120,7 @@ namespace SMESH
 
   SMESHGUI_EXPORT
   // name of proprty saving plug-in of a hypothesis
-  const char* Plugin_Name() { return "PLUGIN_NAME"; }
+  inline const char* Plugin_Name() { return "PLUGIN_NAME"; }
 }
 
 #endif // SMESHGUI_HYPOTHESESUTILS_H