diff --git a/gribapi/errors.py b/gribapi/errors.py
index 520d223..891a2ac 100644
--- a/gribapi/errors.py
+++ b/gribapi/errors.py
@@ -26,7 +26,7 @@ class GribInternalError(Exception):
     def __init__(self, value):
         # Call the base class constructor with the parameters it needs
         Exception.__init__(self, value)
-        if type(value) is int:
+        if isinstance(value, int):
             self.msg = ffi.string(lib.grib_get_error_message(value)).decode(ENC)
         else:
             self.msg = value
diff --git a/tests/test_eccodes.py b/tests/test_eccodes.py
index 66279d6..a088be8 100644
--- a/tests/test_eccodes.py
+++ b/tests/test_eccodes.py
@@ -58,11 +58,11 @@ def test_codes_set_samples_path():
 
 def test_api_version():
     vs = eccodes.codes_get_api_version()
-    assert type(vs) is str
+    assert isinstance(vs, str)
     assert len(vs) > 0
     assert vs == eccodes.codes_get_api_version(str)
     vi = eccodes.codes_get_api_version(int)
-    assert type(vi) is int
+    assert isinstance(vi, int)
     assert vi > 20000
     print(vi)