diff --git a/vyper/semantics/types/base.py b/vyper/semantics/types/base.py
index cc6f7e99a8..202901d73e 100644
--- a/vyper/semantics/types/base.py
+++ b/vyper/semantics/types/base.py
@@ -169,7 +169,7 @@ def abi_type(self) -> ABIType:
         """
         The ABI type corresponding to this type
         """
-        raise CompilerPanic("Method must be implemented by the inherited class")
+        raise CompilerPanic(f"Not ABI-encodable: {self}")
 
     def get_size_in(self, location: DataLocation) -> int:
         if location in (DataLocation.STORAGE, DataLocation.TRANSIENT):