diff --git a/src/common/strconv.cpp b/src/common/strconv.cpp
index 76a1931763..ed4d3d889e 100644
--- a/src/common/strconv.cpp
+++ b/src/common/strconv.cpp
@@ -2599,7 +2599,7 @@ wxMBConv *wxCSConv::DoCreate() const
                 delete conv;
             }
 
-            gs_nameCache[encoding] = ""; // cache the failure
+            gs_nameCache[encoding] = _T(""); // cache the failure
         }
 #endif // wxUSE_FONTMAP
     }