diff -up ./gtksourceview/gtksourceiter.c.deprecated ./gtksourceview/gtksourceiter.c
--- ./gtksourceview/gtksourceiter.c.deprecated	2011-11-08 16:54:26.428046498 +0000
+++ ./gtksourceview/gtksourceiter.c	2011-11-08 16:54:26.437047643 +0000
@@ -80,7 +80,7 @@ exact_prefix_cmp (const gchar *string,
 	/* If string contains prefix, check that prefix is not followed
 	 * by a unicode mark symbol, e.g. that trailing 'a' in prefix
 	 * is not part of two-char a-with-hat symbol in string. */
-	return type != G_UNICODE_COMBINING_MARK &&
+	return type != G_UNICODE_SPACING_MARK &&
 		type != G_UNICODE_ENCLOSING_MARK &&
 		type != G_UNICODE_NON_SPACING_MARK;
 }