diff --git a/t/lib-git-p4.sh b/t/lib-git-p4.sh
index 4ff2bb1..5aa8adc 100644
--- a/t/lib-git-p4.sh
+++ b/t/lib-git-p4.sh
@@ -48,7 +48,7 @@
 P4PORT=localhost:$P4DPORT
 P4CLIENT=client
 P4USER=author
-P4EDITOR=:
+P4EDITOR=true
 unset P4CHARSET
 export P4PORT P4CLIENT P4USER P4EDITOR P4CHARSET
 
@@ -57,6 +57,12 @@
 git="$TRASH_DIRECTORY/git"
 pidfile="$TRASH_DIRECTORY/p4d.pid"
 
+# git p4 submit generates a temp file, which will
+# not get cleaned up if the submission fails.  Don't
+# clutter up /tmp on the test machine.
+TMPDIR="$TRASH_DIRECTORY"
+export TMPDIR
+
 start_p4d() {
 	mkdir -p "$db" "$cli" "$git" &&
 	rm -f "$pidfile" &&