diff --git a/Src/exec.c b/Src/exec.c
index 97823760f..1bbefd985 100644
--- a/Src/exec.c
+++ b/Src/exec.c
@@ -2302,7 +2302,8 @@ closemn(struct multio **mfds, int fd, int type)
 			break;
 		}
 		for (i = 0; i < mn->ct; i++)
-		    write_loop(mn->fds[i], buf, len);
+		    if (write_loop(mn->fds[i], buf, len) < 0)
+			break;
 	    }
 	} else {
 	    /* cat process */
@@ -2314,7 +2315,8 @@ closemn(struct multio **mfds, int fd, int type)
 			else
 			    break;
 		    }
-		    write_loop(mn->pipe, buf, len);
+		    if (write_loop(mn->pipe, buf, len) < 0)
+			break;
 		}
 	}
 	_exit(0);