diff --git a/PDP10/kx10_cpu.c b/PDP10/kx10_cpu.c
index 888b1d5..788fe73 100644
--- a/PDP10/kx10_cpu.c
+++ b/PDP10/kx10_cpu.c
@@ -2072,12 +2072,18 @@ int page_lookup(t_addr addr, int flag, t_addr *loc, int wr, int cur_context, int
         }
     }
 
+#if KS_ITS
+    if (!QITS) {     /* Do not do this on ITS */
+#endif
     /* Handle KI paging odditiy */
     if (!uf && !t20_page && (page & 0740) == 0340) {
         /* Pages 340-377 via UBT */
         page += 01000 - 0340;
         upmp = 1;
     }
+#if KS_ITS
+    }
+#endif
 
     /* Map the page */
     if (uf || upmp)
@@ -2594,12 +2600,18 @@ int page_lookup(t_addr addr, int flag, t_addr *loc, int wr, int cur_context, int
         return 0;
     }
 
+#if KS_ITS
+    if (!QITS) {     /* Do not do this on ITS */
+#endif
     /* Handle KI paging odditiy */
     if (!uf && !t20_page && (page & 0740) == 0340) {
         /* Pages 340-377 via UBT */
         page += 01000 - 0340;
         upmp = 1;
     }
+#if KS_ITS
+    }
+#endif
 
     /* Map the page */
     if (uf || upmp)