diff --git a/jedi/_compatibility.py b/jedi/_compatibility.py
index 3f0f824b..d7d4b827 100644
--- a/jedi/_compatibility.py
+++ b/jedi/_compatibility.py
@@ -135,15 +135,6 @@ class ImplicitNSInfo(object):
         self.paths = paths
 
 
-if True:
-    all_suffixes = importlib.machinery.all_suffixes
-else:
-    def all_suffixes():
-        # Is deprecated and raises a warning in Python 3.6.
-        import imp
-        return [suffix for suffix, _, _ in imp.get_suffixes()]
-
-
 # unicode function
 try:
     unicode = unicode
diff --git a/jedi/inference/compiled/subprocess/functions.py b/jedi/inference/compiled/subprocess/functions.py
index a625b65c..23c5c827 100644
--- a/jedi/inference/compiled/subprocess/functions.py
+++ b/jedi/inference/compiled/subprocess/functions.py
@@ -3,9 +3,9 @@ import sys
 import os
 import re
 import inspect
+from importlib.machinery import all_suffixes
 
-from jedi._compatibility import find_module, cast_path, \
-    all_suffixes
+from jedi._compatibility import find_module, cast_path
 from jedi.inference.compiled import access
 from jedi import debug
 from jedi import parser_utils
diff --git a/jedi/inference/sys_path.py b/jedi/inference/sys_path.py
index 58193d9e..d16529c2 100644
--- a/jedi/inference/sys_path.py
+++ b/jedi/inference/sys_path.py
@@ -1,7 +1,8 @@
 import os
 import re
+from importlib.machinery import all_suffixes
 
-from jedi._compatibility import unicode, all_suffixes
+from jedi._compatibility import unicode
 from jedi.inference.cache import inference_state_method_cache
 from jedi.inference.base_value import ContextualizedNode
 from jedi.inference.helpers import is_string, get_str_or_none