diff --git a/lib/blockchain/chain.js b/lib/blockchain/chain.js
index 1cef54bc..6ab9a9d8 100644
--- a/lib/blockchain/chain.js
+++ b/lib/blockchain/chain.js
@@ -2093,10 +2093,12 @@ Chain.prototype.computeBlockVersion = co(function* computeBlockVersion(prev) {
 Chain.prototype.getDeploymentState = co(function* getDeploymentState() {
   var prev = yield this.tip.getPrevious();
 
-  if (!prev)
+  if (!prev) {
+    assert(this.tip.isGenesis());
     return this.state;
+  }
 
-  return yield this.getDeployments(this.tip, prev);
+  return yield this.getDeployments(this.tip.toHeaders(), prev);
 });
 
 /**