diff --git a/tests/test-check-pyflakes.t b/tests/test-check-pyflakes.t
--- a/tests/test-check-pyflakes.t
+++ b/tests/test-check-pyflakes.t
@@ -6,11 +6,11 @@
 run pyflakes on all tracked files ending in .py or without a file ending
 (skipping binary file random-seed)
 
-  $ cat > test.py <<EOF
+  $ cat > "$TESTTMP/test.py" <<EOF
   > print(undefinedname)
   > EOF
-  $ pyflakes test.py 2>/dev/null | "$TESTDIR/filterpyflakes.py"
-  test.py:1: undefined name 'undefinedname'
+  $ pyflakes "$TESTTMP/test.py" 2>/dev/null | "$TESTDIR/filterpyflakes.py"
+  $TESTTMP/test.py:1: undefined name 'undefinedname'
   
 
   $ testrepohg locate 'set:**.py or grep("^#!.*python")' \