diff --git a/src/cmd/as/as.c b/src/cmd/as/as.c
index 08a5172..21bea9e 100644
--- a/src/cmd/as/as.c
+++ b/src/cmd/as/as.c
@@ -520,7 +520,12 @@ void startup ()
 {
     register int i;
 
-    mktemp (tfilename);
+    int fd = mkstemp (tfilename);
+    if (fd == -1) {
+        uerror ("cannot create temporary file %2", tfilename);
+    } else {
+        close(fd);
+    }
     for (i=STEXT; i<SBSS; i++) {
         sfile [i] = fopen (tfilename, "w+");
         if (! sfile [i])
diff --git a/src/cmd/ld/ld.c b/src/cmd/ld/ld.c
index 972624d..c3ee90d 100644
--- a/src/cmd/ld/ld.c
+++ b/src/cmd/ld/ld.c
@@ -1287,7 +1287,13 @@ void middle()
 void setupout ()
 {
 	tcreat (&outb, 0);
-	mktemp (tfname);
+	int fd = mkstemp (tfname);
+    if (fd == -1) {
+        error(2, "internal error: unable to create temporary file %s", tfname);
+    } else {
+        close(fd);
+    }
+        
 	tcreat (&toutb, 1);
 	tcreat (&doutb, 1);