diff --git a/brownie/project/compiler/vyper.py b/brownie/project/compiler/vyper.py
index ddc34ffb9..346ad162a 100644
--- a/brownie/project/compiler/vyper.py
+++ b/brownie/project/compiler/vyper.py
@@ -98,7 +98,7 @@ def _get_vyper_version_list() -> Tuple[List, List]:
             print(v)
             print(type(v))
             print(v.__dict__)
-    return AVAILABLE_VYPER_VERSIONS, [v if isinstance(v, Version) else Version(v) for v in installed_versions]
+    return AVAILABLE_VYPER_VERSIONS, [v if isinstance(v, Version) else Version(str(v)) for v in installed_versions]
 
 
 def install_vyper(*versions: str) -> None: