diff --git a/openapi_spec_validator/validation/protocols.py b/openapi_spec_validator/validation/protocols.py
index da28afe..b876987 100644
--- a/openapi_spec_validator/validation/protocols.py
+++ b/openapi_spec_validator/validation/protocols.py
@@ -1,19 +1,16 @@
+import sys
 from typing import TYPE_CHECKING
 from typing import Any
 from typing import Hashable
 from typing import Iterator
 from typing import Mapping
 
-if TYPE_CHECKING:
+if sys.version_info >= (3, 8):
+    from typing import Protocol
+    from typing import runtime_checkable
+else:
     from typing_extensions import Protocol
     from typing_extensions import runtime_checkable
-else:
-    try:
-        from typing import Protocol
-        from typing import runtime_checkable
-    except ImportError:
-        from typing_extensions import Protocol
-        from typing_extensions import runtime_checkable
 
 from openapi_spec_validator.validation.exceptions import OpenAPIValidationError