diff --git a/src/common/utilscmn.cpp b/src/common/utilscmn.cpp
index b70f18f5a2..da02376e24 100644
--- a/src/common/utilscmn.cpp
+++ b/src/common/utilscmn.cpp
@@ -633,7 +633,11 @@ static bool ReadAll(wxInputStream *is, wxArrayString& output)
     // Notice that wxTextInputStream doesn't work correctly with wxConvAuto
     // currently, see #14720, so use the current locale conversion explicitly
     // under assumption that any external program should be using it too.
-    wxTextInputStream tis(*is, " \t", wxConvLibc);
+    wxTextInputStream tis(*is, " \t"
+#if wxUSE_UNICODE
+                                    , wxConvLibc
+#endif
+                                                );
 
     for ( ;; )
     {