diff --git a/top/top.c b/top/top.c
index 40391f68..b44aecfc 100644
--- a/top/top.c
+++ b/top/top.c
@@ -2457,7 +2457,11 @@ static void zap_fieldstab (void) {
    Cpu_pmax = 99.9;
    if (Rc.mode_irixps && Cpu_cnt > 1 && !Thread_mode) {
       Cpu_pmax = 100.0 * Cpu_cnt;
-      if (Cpu_cnt > 10) {
+      if (Cpu_cnt > 1000) {
+         if (Cpu_pmax > 9999999.0) Cpu_pmax = 9999999.0;
+      } else if (Cpu_cnt > 100) {
+         if (Cpu_cnt > 999999.0) Cpu_pmax = 999999.0;
+      } else if (Cpu_cnt > 10) {
          if (Cpu_pmax > 99999.0) Cpu_pmax = 99999.0;
       } else {
          if (Cpu_pmax > 999.9) Cpu_pmax = 999.9;