diff --git a/py/code/testing/test_excinfo.py b/py/code/testing/test_excinfo.py
index f6927fcb4..9341fe61f 100644
--- a/py/code/testing/test_excinfo.py
+++ b/py/code/testing/test_excinfo.py
@@ -212,7 +212,7 @@ def test_excinfo_str():
     print s
     assert s.startswith(__file__[:-1]) # pyc file 
     assert s.endswith("ValueError")
-    assert len(s.split(":")) == 3
+    assert len(s.split(":")) >= 3 # on windows it's 4
 
 def test_excinfo_errisinstance():
     excinfo = py.test.raises(ValueError, h)
diff --git a/py/misc/testing/test_com.py b/py/misc/testing/test_com.py
index 6122ab124..84a2e6b7c 100644
--- a/py/misc/testing/test_com.py
+++ b/py/misc/testing/test_com.py
@@ -207,8 +207,8 @@ def test_subprocess_env(testdir, monkeypatch):
     try:
         monkeypatch.setitem(os.environ, "PYLIB", 'unknownconsider')
         excinfo = py.test.raises(py.process.cmdexec.Error, """
-            py.process.cmdexec("python -c 'import py'")
-        """)
+            py.process.cmdexec('%s -c "import py"')
+        """ % py.std.sys.executable)
         assert str(excinfo.value).find("ImportError") != -1
         assert str(excinfo.value).find("unknownconsider") != -1
     finally: