--- graphite/wrappers/pangographite/graphite-module.c	(revision 827)
+++ graphite/wrappers/pangographite/graphite-module.c	(working copy)
@@ -149,6 +149,7 @@ 
 {
     g_return_if_fail (PANGO_IS_FC_FONT (font));
     PangoFcFont *fcfont = PANGO_FC_FONT(font);
+    g_return_if_fail (pango_fc_font_lock_face(fcfont));
     //static GStaticMutex mutex = G_STATIC_MUTEX_INIT;
 
     //g_static_mutex_lock (&mutex);
@@ -157,6 +158,7 @@ 
       pango_language_to_string(analysis->language), analysis->level % 2);
 
     //g_static_mutex_unlock (&mutex);
+    pango_fc_font_unlock_face(fcfont);
 }
 
 static PangoCoverageLevel
@@ -233,7 +235,7 @@ 
       }
       else
       {
-        if (strstr((char*)fontcap, "ttable:Silf"))
+        if (strstr((char*)fontcap, "ttable:Silf") && pango_fc_font_lock_face(fcfont))
         {
           //static GStaticMutex mutex = G_STATIC_MUTEX_INIT;
       
@@ -244,6 +246,7 @@ 
             pango_language_to_string(analysis->language),
             analysis->level % 2);
           //g_static_mutex_unlock (&mutex);
+          pango_fc_font_unlock_face(fcfont);
           //return;
         }
       }