diff --git a/src/cmd/ksh93/sh/io.c b/src/cmd/ksh93/sh/io.c
index 5db81ba3e..fc88cb0bc 100644
--- a/src/cmd/ksh93/sh/io.c
+++ b/src/cmd/ksh93/sh/io.c
@@ -1045,9 +1045,9 @@ static Sfoff_t	file_offset(int fn, char *fname)
  */
 void sh_pclose(register int pv[])
 {
-	if(pv[0]>=2)
+	if(pv[0] > -1)
 		sh_close(pv[0]);
-	if(pv[1]>=2)
+	if(pv[1] > -1)
 		sh_close(pv[1]);
 	pv[0] = pv[1] = -1;
 }
diff --git a/src/cmd/ksh93/sh/jobs.c b/src/cmd/ksh93/sh/jobs.c
index 27abc493b..0d55fe9b4 100644
--- a/src/cmd/ksh93/sh/jobs.c
+++ b/src/cmd/ksh93/sh/jobs.c
@@ -396,10 +396,11 @@ int job_reap(register int sig)
 			/* check for coprocess completion */
 			if(pid==sh.cpid)
 			{
-				sh_close(sh.coutpipe);
-				sh_close(sh.cpipe[1]);
-				sh.cpipe[1] = -1;
-				sh.coutpipe = -1;
+				if(sh.coutpipe > -1)
+					sh_close(sh.coutpipe);
+				if(sh.cpipe[1] > -1)
+					sh_close(sh.cpipe[1]);
+				sh.coutpipe = sh.cpipe[1] = -1;
 			}
 			else if(sh.subshell)
 				sh_subjobcheck(pid);
diff --git a/src/cmd/ksh93/sh/path.c b/src/cmd/ksh93/sh/path.c
index e3bda4046..363a1debf 100644
--- a/src/cmd/ksh93/sh/path.c
+++ b/src/cmd/ksh93/sh/path.c
@@ -1275,10 +1275,13 @@ static noreturn void exscript(register char *path,register char *argv[],char **e
 	sh.bckpid = 0;
 	sh.st.ioset=0;
 	/* clean up any cooperating processes */
-	if(sh.cpipe[0]>0)
+	if(sh.cpipe[0] > -1)
 		sh_pclose(sh.cpipe);
-	if(sh.cpid && sh.outpipe)
+	if(sh.cpid && sh.outpipe && *sh.outpipe > -1)
+	{
 		sh_close(*sh.outpipe);
+		*sh.outpipe = -1;
+	}
 	sh.cpid = 0;
 	if(sp=fcfile())
 		while(sfstack(sp,SF_POPSTACK));
diff --git a/src/cmd/ksh93/sh/subshell.c b/src/cmd/ksh93/sh/subshell.c
index 05dbdf2cd..92b2a78a7 100644
--- a/src/cmd/ksh93/sh/subshell.c
+++ b/src/cmd/ksh93/sh/subshell.c
@@ -455,8 +455,10 @@ void sh_subjobcheck(pid_t pid)
 	{
 		if(sp->cpid==pid)
 		{
-			sh_close(sp->coutpipe);
-			sh_close(sp->cpipe);
+			if(sp->coutpipe > -1)
+				sh_close(sp->coutpipe);
+			if(sp->cpipe > -1)
+				sh_close(sp->cpipe);
 			sp->coutpipe = sp->cpipe = -1;
 			return;
 		}