diff --git a/PDP10/kx10_cpu.c b/PDP10/kx10_cpu.c
index 2c6ff41fb..2e921cfb9 100644
--- a/PDP10/kx10_cpu.c
+++ b/PDP10/kx10_cpu.c
@@ -12257,7 +12257,7 @@ if ((reason = build_dev_tab ()) != SCPE_OK)            /* build, chk dib_tab */
         pi_restore = 0;
     }
     sim_interval--;
-    if (!pi_cycle && instr_count != 0 && --instr_count == 0) {
+    if (f_load_pc && !pi_cycle && instr_count != 0 && --instr_count == 0) {
 #if ITS
         if (QITS)
             load_quantum();