diff --git a/src/mudsys/initm.374 b/src/mudsys/initm.374
index b6baba26..6e501009 100644
--- a/src/mudsys/initm.374
+++ b/src/mudsys/initm.374
@@ -462,9 +462,10 @@ PURIMP:	MOVE	A,FRETOP
 	HRL	B,A
 	DOTCAL	CORBLK,[[1000,,0],[1000,,-1],B]
 	 FATAL	INITM -- CAN'T FLUSH MIDDLE CORE
-	MOVE	A,[-<400-PHIBOT>,,PHIBOT]
-	DOTCAL	CORBLK,[[1000,,210000],[1000,,-1],A]
-	 FATAL	INITM -- CAN'T PURIFY HIGH CORE
+;Disabled because this fails with ITS 1648.
+;	MOVE	A,[-<400-PHIBOT>,,PHIBOT]
+;	DOTCAL	CORBLK,[[1000,,210000],[1000,,-1],A]
+;	 FATAL	INITM -- CAN'T PURIFY HIGH CORE
 ]
 
 IFE ITS,[