diff --git a/src/cares_wrap.cc b/src/cares_wrap.cc
index db2526fd51..2d183395b3 100644
--- a/src/cares_wrap.cc
+++ b/src/cares_wrap.cc
@@ -989,8 +989,6 @@ void AfterGetNameInfo(uv_getnameinfo_t* req,
 
 
 static void IsIP(const FunctionCallbackInfo<Value>& args) {
-  Environment* env = Environment::GetCurrent(args.GetIsolate());
-
   node::Utf8Value ip(args[0]);
   char address_buffer[sizeof(struct in6_addr)];
 
diff --git a/src/node.cc b/src/node.cc
index 0725450245..d85b1e781e 100644
--- a/src/node.cc
+++ b/src/node.cc
@@ -2828,11 +2828,8 @@ static void SignalExit(int signo) {
 // when debugging the stream.Writable class or the process.nextTick
 // function, it is useful to bypass JavaScript entirely.
 static void RawDebug(const FunctionCallbackInfo<Value>& args) {
-  Environment* env = Environment::GetCurrent(args.GetIsolate());
-
   CHECK(args.Length() == 1 && args[0]->IsString() &&
         "must be called with a single string");
-
   node::Utf8Value message(args[0]);
   fprintf(stderr, "%s\n", *message);
   fflush(stderr);
diff --git a/src/node_zlib.cc b/src/node_zlib.cc
index 45ef0b25f6..e3165b2b30 100644
--- a/src/node_zlib.cc
+++ b/src/node_zlib.cc
@@ -381,8 +381,6 @@ class ZCtx : public AsyncWrap {
 
   // just pull the ints out of the args and call the other Init
   static void Init(const FunctionCallbackInfo<Value>& args) {
-    Environment* env = Environment::GetCurrent(args.GetIsolate());
-
     CHECK((args.Length() == 4 || args.Length() == 5) &&
            "init(windowBits, level, memLevel, strategy, [dictionary])");
 
@@ -421,20 +419,13 @@ class ZCtx : public AsyncWrap {
   }
 
   static void Params(const FunctionCallbackInfo<Value>& args) {
-    Environment* env = Environment::GetCurrent(args.GetIsolate());
-
     CHECK(args.Length() == 2 && "params(level, strategy)");
-
     ZCtx* ctx = Unwrap<ZCtx>(args.Holder());
-
     Params(ctx, args[0]->Int32Value(), args[1]->Int32Value());
   }
 
   static void Reset(const FunctionCallbackInfo<Value> &args) {
-    Environment* env = Environment::GetCurrent(args.GetIsolate());
-
     ZCtx* ctx = Unwrap<ZCtx>(args.Holder());
-
     Reset(ctx);
     SetDictionary(ctx);
   }