diff --git a/top/top.c b/top/top.c
index 0d51a88f..00658018 100644
--- a/top/top.c
+++ b/top/top.c
@@ -2021,6 +2021,7 @@ static void calibrate_fields (void) {
 #endif
             }
          }
+         if (!w->totpflgs) w->pflgsall[w->totpflgs++] = EU_PID;
 
          /* build a preliminary columns header not to exceed screen width
             while accounting for a possible leading window number */