diff --git a/ChangeLog b/ChangeLog
index 63c44cd..fbec32e 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+2005-04-13  Ross Burton  <ross@burtonini.com>
+
+	* src/fcpat.c:
+	Check that a pattern isn't already frozen in FcPatternFreeze.
+
 2005-03-31  Ross Burton  <ross@burtonini.com>
 
 	* src/fclist.c:
diff --git a/src/fcpat.c b/src/fcpat.c
index 32054e1..c886c92 100644
--- a/src/fcpat.c
+++ b/src/fcpat.c
@@ -538,6 +538,9 @@ FcPatternFreeze (FcPattern *p)
     int		size;
     int		i;
     
+    if (p->ref == FC_REF_CONSTANT)
+       return p;
+
     size = sizeof (FcPattern) + p->num * sizeof (FcPatternElt);
     b = (FcPattern *) malloc (size);
     if (!b)