diff --git a/contrib/mgpg b/contrib/mgpg
index 01c7c08..38eec99 100755
--- a/contrib/mgpg
+++ b/contrib/mgpg
@@ -1,6 +1,6 @@
 #!/bin/sh -e
 
-tmp=$(mktemp)
+tmp=$(mktemp -t mgpg.XXXXXX)
 trap "rm -f '$tmp'" INT TERM EXIT
 
 {