diff --git a/Lib/test/test_atexit.py b/Lib/test/test_atexit.py
index 324b76e..1d120df 100644
--- a/Lib/test/test_atexit.py
+++ b/Lib/test/test_atexit.py
@@ -27,7 +27,7 @@
 f.write(input)
 f.close()
 
-p = popen("%s %s" % (executable, fname))
+p = popen('"%s" %s' % (executable, fname))
 output = p.read()
 p.close()
 vereq(output, """\
@@ -55,7 +55,7 @@
 f.write(input)
 f.close()
 
-p = popen("%s %s" % (executable, fname))
+p = popen('"%s" %s' % (executable, fname))
 output = p.read()
 p.close()
 vereq(output, """\
diff --git a/Lib/test/test_popen.py b/Lib/test/test_popen.py
index 9111ec5..7a0ef9b 100644
--- a/Lib/test/test_popen.py
+++ b/Lib/test/test_popen.py
@@ -15,7 +15,7 @@
 # This results in Python being spawned and printing the sys.argv list.
 # We can then eval() the result of this, and see what each argv was.
 def _do_test_commandline(cmdline, expected):
-    cmd = '%s -c "import sys;print sys.argv" %s' % (sys.executable, cmdline)
+    cmd = '"%s" -c "import sys;print sys.argv" %s' % (sys.executable, cmdline)
     data = popen(cmd).read()
     got = eval(data)[1:] # strip off argv[0]
     if got != expected: