diff --git a/ape_etherscan/verify.py b/ape_etherscan/verify.py
index 947a633..1f94019 100644
--- a/ape_etherscan/verify.py
+++ b/ape_etherscan/verify.py
@@ -266,7 +266,14 @@ def attempt_verification(self):
         if compiler:
             settings = self.compiler.settings or {}
             output_contracts = settings.get("outputSelection", {})
-            for cname in self.compiler.contractTypes or []:
+            for contract_id in self.compiler.contractTypes or []:
+                parts = contract_id.split(":")
+                if len(parts) != 2:
+                    # Bad compiler.
+                    valid = False
+                    continue
+
+                _, cname  = parts
                 if cname not in output_contracts:
                     valid = False
                     break