diff --git a/packages/babel-plugin-transform-regenerator/lib/emit.js b/packages/babel-plugin-transform-regenerator/lib/emit.js
index dda375c806..884f325154 100644
--- a/packages/babel-plugin-transform-regenerator/lib/emit.js
+++ b/packages/babel-plugin-transform-regenerator/lib/emit.js
@@ -321,8 +321,6 @@ Ep.getTryLocsList = function() {
 // No destructive modification of AST nodes.
 
 Ep.explode = function(path, ignoreResult) {
-  assert.ok(path instanceof traverse.NodePath);
-
   var node = path.node;
   var self = this;
 
@@ -370,8 +368,6 @@ function getDeclError(node) {
 }
 
 Ep.explodeStatement = function(path, labelId) {
-  assert.ok(path instanceof traverse.NodePath);
-
   var stmt = path.node;
   var self = this;
 
@@ -886,8 +882,6 @@ Ep.updateContextPrevLoc = function(loc) {
 };
 
 Ep.explodeExpression = function(path, ignoreResult) {
-  assert.ok(path instanceof traverse.NodePath);
-
   var expr = path.node;
   if (expr) {
     t.assertExpression(expr);
diff --git a/packages/babel-plugin-transform-regenerator/lib/hoist.js b/packages/babel-plugin-transform-regenerator/lib/hoist.js
index e7a36cad73..9ca822485b 100644
--- a/packages/babel-plugin-transform-regenerator/lib/hoist.js
+++ b/packages/babel-plugin-transform-regenerator/lib/hoist.js
@@ -18,7 +18,6 @@ var hasOwn = Object.prototype.hasOwnProperty;
 // returns a VariableDeclaration containing just the names of the removed
 // declarations.
 exports.hoist = function(funPath) {
-  assert.ok(funPath instanceof traverse.NodePath);
   t.assertFunction(funPath.node);
 
   var vars = {};
diff --git a/packages/babel-plugin-transform-regenerator/lib/visit.js b/packages/babel-plugin-transform-regenerator/lib/visit.js
index cfba36a919..d7b930a70e 100644
--- a/packages/babel-plugin-transform-regenerator/lib/visit.js
+++ b/packages/babel-plugin-transform-regenerator/lib/visit.js
@@ -177,7 +177,6 @@ function getOuterFnExpr(funPath) {
 }
 
 function getRuntimeMarkDecl(blockPath) {
-  assert.ok(blockPath instanceof traverse.NodePath);
   var block = blockPath.node;
   assert.ok(Array.isArray(block.body));
 
@@ -206,8 +205,6 @@ function getRuntimeMarkDecl(blockPath) {
 }
 
 function renameArguments(funcPath, argsId) {
-  assert.ok(funcPath instanceof traverse.NodePath);
-
   var state = {
     didRenameArguments: false,
     argsId: argsId