diff -r 08424e2e79e4 -r b4162824cdea src/gamelog.cpp
--- a/src/gamelog.cpp	Thu Jun 05 20:54:52 2008 +0000
+++ b/src/gamelog.cpp	Fri Jun 06 19:27:09 2008 +0000
@@ -502,7 +502,7 @@
  */
 void GamelogGRFCompatible(const GRFIdentifier *newg)
 {
-	assert(_gamelog_action_type == GLAT_LOAD);
+	assert(_gamelog_action_type == GLAT_LOAD || _gamelog_action_type == GLAT_GRF);
 
 	LoggedChange *lc = GamelogChange(GLCT_GRFCOMPAT);
 	if (lc == NULL) return;