diff --git a/ProcessUNIX.c b/ProcessUNIX.c
index d9e6691d171a63a098797da338dbc69184f7bde0..b93e0e6720fd4409b5e02b3ff2538b57edcc58ba 100644
--- a/ProcessUNIX.c
+++ b/ProcessUNIX.c
@@ -1997,8 +1997,11 @@ static void kwsysProcessKill(pid_t process_id)
           kwsysProcessKill(pid);
           }
         }
+      }
 
-      /* We are done with the ps process.  */
+    /* We are done with the ps process.  */
+    if(ps)
+      {
       pclose(ps);
       }
     }