diff -p -up gtksourceview-2.5.1/gtksourceview/gtksourcecontextengine.c~ gtksourceview-2.5.1/gtksourceview/gtksourcecontextengine.c
--- gtksourceview-2.5.1/gtksourceview/gtksourcecontextengine.c~	2008-12-23 20:36:10.000000000 +0100
+++ gtksourceview-2.5.1/gtksourceview/gtksourcecontextengine.c	2008-12-27 17:24:25.000000000 +0100
@@ -2590,7 +2590,7 @@ regex_new (const gchar           *patter
 	if (find_single_byte_escape (pattern))
 	{
 		g_set_error (error, GTK_SOURCE_CONTEXT_ENGINE_ERROR,
-			     GTK_SOURCE_CONTEXT_ENGINE_ERROR_INVALID_REGEX,
+			     GTK_SOURCE_CONTEXT_ENGINE_ERROR_INVALID_REGEX,"%s", 
 			     _("using \\C is not supported in language definitions"));
 		return NULL;
 	}
@@ -4530,7 +4530,7 @@ analyze_line (GtkSourceContextEngine *ce
 
 		if (g_timer_elapsed (timer, NULL) * 1000 > MAX_TIME_FOR_ONE_LINE)
 		{
-			g_critical (_("Highlighting a single line took too much time, "
+			g_critical ("%s",_("Highlighting a single line took too much time, "
 				      "syntax highlighting will be disabled"));
 			disable_highlighting (ce);
 			break;
diff -p -up gtksourceview-2.5.1/tests/test-widget.c~ gtksourceview-2.5.1/tests/test-widget.c
--- gtksourceview-2.5.1/tests/test-widget.c~	2008-12-23 20:36:10.000000000 +0100
+++ gtksourceview-2.5.1/tests/test-widget.c	2008-12-27 17:29:03.000000000 +0100
@@ -261,7 +261,7 @@ error_dialog (GtkWindow *parent, const g
 					 GTK_DIALOG_DESTROY_WITH_PARENT,
 					 GTK_MESSAGE_ERROR,
 					 GTK_BUTTONS_OK,
-					 tmp);
+					 "%s", tmp);
 	g_free (tmp);
 
 	gtk_dialog_run (GTK_DIALOG (dialog));