diff --git a/types/node/index.d.ts b/types/node/index.d.ts
index 9980eee71d..6f0c42528b 100644
--- a/types/node/index.d.ts
+++ b/types/node/index.d.ts
@@ -1439,13 +1439,27 @@ declare module "zlib" {
         dictionary?: any; // deflate/inflate only, empty dictionary by default
     }
 
-    export interface Gzip extends stream.Transform { }
-    export interface Gunzip extends stream.Transform { }
-    export interface Deflate extends stream.Transform { }
-    export interface Inflate extends stream.Transform { }
-    export interface DeflateRaw extends stream.Transform { }
-    export interface InflateRaw extends stream.Transform { }
-    export interface Unzip extends stream.Transform { }
+    export interface Zlib {
+        readonly bytesRead: number;
+        close(callback?: Function): void;
+        flush(callback?: Function): void;
+    }
+
+    export interface ZlibParams {
+        params(level: number, strategy: number, callback?: Function): void;
+    }
+
+    export interface ZlibReset {
+        reset(): void;
+    }
+
+    export interface Gzip extends stream.Transform, Zlib { }
+    export interface Gunzip extends stream.Transform, Zlib { }
+    export interface Deflate extends stream.Transform, Zlib, ZlibReset, ZlibParams { }
+    export interface Inflate extends stream.Transform, Zlib, ZlibReset { }
+    export interface DeflateRaw extends stream.Transform, Zlib, ZlibReset, ZlibParams { }
+    export interface InflateRaw extends stream.Transform, Zlib, ZlibReset { }
+    export interface Unzip extends stream.Transform, Zlib { }
 
     export function createGzip(options?: ZlibOptions): Gzip;
     export function createGunzip(options?: ZlibOptions): Gunzip;
diff --git a/types/node/node-tests.ts b/types/node/node-tests.ts
index 8742a476c5..40703d813a 100644
--- a/types/node/node-tests.ts
+++ b/types/node/node-tests.ts
@@ -798,13 +798,16 @@ function stream_readable_pipe_test() {
     var z = zlib.createGzip({ finishFlush: zlib.constants.Z_FINISH });
     var w = fs.createWriteStream('file.txt.gz');
 
+    assert(typeof z.bytesRead === 'number');
     assert(typeof r.bytesRead === 'number');
     assert(typeof r.path === 'string');
     assert(rs.path instanceof Buffer);
 
     r.pipe(z).pipe(w);
 
+    z.flush();
     r.close();
+    z.close();
     rs.close();
 }