diff --git a/chain/actors/policy/policy.go b/chain/actors/policy/policy.go
index eec52e855..b8205177e 100644
--- a/chain/actors/policy/policy.go
+++ b/chain/actors/policy/policy.go
@@ -22,12 +22,10 @@ func SetSupportedProofTypes(types ...abi.RegisteredSealProof) {
 // AddSupportedProofTypes sets supported proof types, across all actor versions.
 // This should only be used for testing.
 func AddSupportedProofTypes(types ...abi.RegisteredSealProof) {
-	newTypes := make(map[abi.RegisteredSealProof]struct{}, len(types))
 	for _, t := range types {
-		newTypes[t] = struct{}{}
+		// Set for all miner versions.
+		miner0.SupportedProofTypes[t] = struct{}{}
 	}
-	// Set for all miner versions.
-	miner0.SupportedProofTypes = newTypes
 }
 
 // SetPreCommitChallengeDelay sets the pre-commit challenge delay across all