diff --git a/src/generic/dcpsg.cpp b/src/generic/dcpsg.cpp
index 4fa2f1d944..94c2a4993f 100644
--- a/src/generic/dcpsg.cpp
+++ b/src/generic/dcpsg.cpp
@@ -1990,6 +1990,8 @@ void wxPostScriptDC::DoGetTextExtent(const wxString& string,
     {
         if (x) (*x) = 0;
         if (y) (*y) = 0;
+        if (descent) (*descent) = 0;
+        if (externalLeading) (*externalLeading) = 0;
         return;
     }