diff --git a/jedi/_compatibility.py b/jedi/_compatibility.py
index 9cce90a5..423c6374 100644
--- a/jedi/_compatibility.py
+++ b/jedi/_compatibility.py
@@ -31,12 +31,19 @@ def find_module_py33(string, path=None):
             module_file = None
         else:
             module_path = loader.get_filename(string)
-            module_file = open(module_path)
+            mode = 'rb' if module_path.endswith(".pyc") else 'r'
+            module_file = open(module_path, mode)
     except AttributeError:
-        # is builtin module
-        module_path = string
-        module_file = None
-        is_package = False
+        # ExtensionLoader has not attribute get_filename, instead it has a
+        # path attribute that we can use to retrieve the module path
+        try:
+            module_path = loader.path
+            module_file = open(loader.path, 'rb')
+        except AttributeError:
+            module_path = string
+            module_file = None
+        finally:
+            is_package = False
 
     return module_file, module_path, is_package
 
diff --git a/pytest.ini b/pytest.ini
index fa132557..0d73061d 100644
--- a/pytest.ini
+++ b/pytest.ini
@@ -2,7 +2,7 @@
 addopts = --doctest-modules
 
 # Ignore broken files in blackbox test directories
-norecursedirs = .* docs completion refactor absolute_import namespace_package scripts
+norecursedirs = .* docs completion refactor absolute_import namespace_package scripts extensions
 
 # Activate `clean_jedi_cache` fixture for all tests.  This should be
 # fine as long as we are using `clean_jedi_cache` as a session scoped
diff --git a/test/extensions/README.rst b/test/extensions/README.rst
new file mode 100644
index 00000000..5f0b69ff
--- /dev/null
+++ b/test/extensions/README.rst
@@ -0,0 +1,10 @@
+This directory contains pre-compiled extensions modules used to test completions
+for compiled modules on Travis-CI (Ubuntu 12.04 64bit).
+
+To build the extensions modules, run::
+
+    python setup.py build_ext -i
+
+
+Then move the compiled modules to their testing package ( ./**compiledXX**, where XX is the
+python version used to run setup.py).
\ No newline at end of file
diff --git a/test/extensions/compiled.pyx b/test/extensions/compiled.pyx
new file mode 100644
index 00000000..1e7c6907
--- /dev/null
+++ b/test/extensions/compiled.pyx
@@ -0,0 +1,6 @@
+cdef class Foo:
+    pass
+
+
+cdef class Bar:
+    pass
diff --git a/test/extensions/compiled27/__init__.py b/test/extensions/compiled27/__init__.py
new file mode 100644
index 00000000..e69de29b
diff --git a/test/extensions/compiled27/compiled.so b/test/extensions/compiled27/compiled.so
new file mode 100755
index 00000000..becbfb56
Binary files /dev/null and b/test/extensions/compiled27/compiled.so differ
diff --git a/test/extensions/compiled32/__init__.py b/test/extensions/compiled32/__init__.py
new file mode 100644
index 00000000..e69de29b
diff --git a/test/extensions/compiled32/compiled.so b/test/extensions/compiled32/compiled.so
new file mode 100755
index 00000000..df34cfa0
Binary files /dev/null and b/test/extensions/compiled32/compiled.so differ
diff --git a/test/extensions/setup.py b/test/extensions/setup.py
new file mode 100644
index 00000000..a13237d2
--- /dev/null
+++ b/test/extensions/setup.py
@@ -0,0 +1,6 @@
+from distutils.core import setup
+from Cython.Build import cythonize
+
+setup(
+    ext_modules=cythonize("compiled.pyx")
+)
diff --git a/test/test_compiled.py b/test/test_compiled.py
new file mode 100644
index 00000000..c783a3e2
--- /dev/null
+++ b/test/test_compiled.py
@@ -0,0 +1,19 @@
+"""
+Test compiled module
+"""
+import os
+import platform
+import sys
+import jedi
+
+from .helpers import cwd_at
+
+
+@cwd_at('test/extensions')
+def test_compiled():
+    if platform.architecture()[0] == '64bit':
+        package_name = "compiled%s%s" % sys.version_info[:2]
+        sys.path.insert(0, os.getcwd())
+        if os.path.exists(package_name):
+            s = jedi.Script("from %s import compiled; compiled." % package_name)
+            assert len(s.completions()) >= 2
diff --git a/test/test_pyc.py b/test/test_pyc.py
new file mode 100644
index 00000000..610b9e06
--- /dev/null
+++ b/test/test_pyc.py
@@ -0,0 +1,56 @@
+"""
+Test completions from *.pyc files:
+
+ - generate a dummy python module
+ - compile the dummy module to generate a *.pyc
+ - delete the pure python dummy module
+ - try jedi on the generated *.pyc
+"""
+import compileall
+import os
+import shutil
+import sys
+
+import jedi
+
+
+SRC = """class Foo:
+    pass
+
+class Bar:
+    pass
+"""
+
+
+def generate_pyc():
+    os.mkdir("dummy_package")
+    with open("dummy_package/__init__.py", 'w'):
+        pass
+    with open("dummy_package/dummy.py", 'w') as f:
+        f.write(SRC)
+    compileall.compile_file("dummy_package/dummy.py")
+    os.remove("dummy_package/dummy.py")
+
+    if sys.version_info[0] == 3:
+        # Python3 specific:
+        # To import pyc modules, we must move them out of the __pycache__
+        # directory and rename them to remove ".cpython-%s%d"
+        # see: http://stackoverflow.com/questions/11648440/python-does-not-detect-pyc-files
+        for f in os.listdir("dummy_package/__pycache__"):
+            dst = f.replace('.cpython-%s%s' % sys.version_info[:2], "")
+            dst = os.path.join("dummy_package", dst)
+            shutil.copy(os.path.join("dummy_package/__pycache__", f), dst)
+
+
+def test_pyc():
+    """
+    The list of completion must be greater than 2.
+    """
+    generate_pyc()
+    s = jedi.Script("from dummy_package import dummy; dummy.")
+    assert len(s.completions()) >= 2
+    shutil.rmtree("dummy_package")
+
+
+if __name__ == "__main__":
+    test_pyc()