diff --git a/vyper/cli/utils.py b/vyper/cli/utils.py
index 8fc64b1cdfb..1ff44a56837 100644
--- a/vyper/cli/utils.py
+++ b/vyper/cli/utils.py
@@ -1,8 +1,21 @@
+from pathlib import Path
+from typing import Sequence
+
 from vyper import ast as vy_ast
 from vyper.exceptions import StructureException
 from vyper.typing import InterfaceImports, SourceCode
 
 
+def get_interface_file_path(base_paths: Sequence, import_path: str) -> Path:
+    relative_path = Path(import_path)
+    for path in base_paths:
+        file_path = path.joinpath(relative_path)
+        suffix = next((i for i in (".vy", ".json") if file_path.with_suffix(i).exists()), None)
+        if suffix:
+            return file_path.with_suffix(suffix)
+    raise FileNotFoundError(f" Cannot locate interface '{import_path}{{.vy,.json}}'")
+
+
 def extract_file_interface_imports(code: SourceCode) -> InterfaceImports:
     ast_tree = vy_ast.parse_to_ast(code)
 
diff --git a/vyper/cli/vyper_compile.py b/vyper/cli/vyper_compile.py
index 5138c4f75a7..10b3d189bbe 100755
--- a/vyper/cli/vyper_compile.py
+++ b/vyper/cli/vyper_compile.py
@@ -5,11 +5,14 @@
 import warnings
 from collections import OrderedDict
 from pathlib import Path
-from typing import Dict, Iterable, Iterator, Sequence, Set, TypeVar
+from typing import Dict, Iterable, Iterator, Set, TypeVar
 
 import vyper
 from vyper.cli import vyper_json
-from vyper.cli.utils import extract_file_interface_imports
+from vyper.cli.utils import (
+    extract_file_interface_imports,
+    get_interface_file_path,
+)
 from vyper.opcodes import DEFAULT_EVM_VERSION, EVM_VERSIONS
 from vyper.parser import parser_utils
 from vyper.settings import VYPER_TRACEBACK_LIMIT
@@ -183,16 +186,6 @@ def get_interface_codes(root_path: Path, contract_sources: ContractCodes) -> Dic
     return interfaces
 
 
-def get_interface_file_path(base_paths: Sequence, import_path: str) -> Path:
-    relative_path = Path(import_path)
-    for path in base_paths:
-        file_path = path.joinpath(relative_path)
-        suffix = next((i for i in (".vy", ".json") if file_path.with_suffix(i).exists()), None)
-        if suffix:
-            return file_path.with_suffix(suffix)
-    raise FileNotFoundError(f" Cannot locate interface '{import_path}{{.vy,.json}}'")
-
-
 def compile_files(
     input_files: Iterable[str],
     output_formats: OutputFormats,
diff --git a/vyper/cli/vyper_json.py b/vyper/cli/vyper_json.py
index 7f172c18e48..39cb7e5c08b 100755
--- a/vyper/cli/vyper_json.py
+++ b/vyper/cli/vyper_json.py
@@ -8,8 +8,10 @@
 from typing import Callable, Dict, Tuple, Union
 
 import vyper
-from vyper.cli.utils import extract_file_interface_imports
-from vyper.cli.vyper_compile import get_interface_file_path
+from vyper.cli.utils import (
+    extract_file_interface_imports,
+    get_interface_file_path,
+)
 from vyper.exceptions import JSONError
 from vyper.opcodes import DEFAULT_EVM_VERSION, EVM_VERSIONS
 from vyper.typing import ContractCodes, ContractPath