diff --git a/src/Kir/Streams/OutputStream.php b/src/Kir/Streams/OutputStream.php
index 2f08005..7d10701 100644
--- a/src/Kir/Streams/OutputStream.php
+++ b/src/Kir/Streams/OutputStream.php
@@ -10,10 +10,4 @@ interface OutputStream extends Stream {
 	 * @return $this
 	 */
 	public function write($data);
-
-	/**
-	 * @throws IOException
-	 * @return $this
-	 */
-	public function flush();
 }
\ No newline at end of file
diff --git a/src/Kir/Streams/Tests/Helper/NondestructiveReadWriteStream.php b/src/Kir/Streams/Tests/Helper/NondestructiveReadWriteStream.php
index 068ffef..75d7808 100644
--- a/src/Kir/Streams/Tests/Helper/NondestructiveReadWriteStream.php
+++ b/src/Kir/Streams/Tests/Helper/NondestructiveReadWriteStream.php
@@ -47,15 +47,6 @@ public function write($data) {
 		return $this;
 	}
 
-	/**
-	 * @throws IOException
-	 * @return $this
-	 */
-	public function flush() {
-		$this->stream->flush();
-		return $this;
-	}
-
 	/**
 	 * @throws IOException
 	 * @param int $pos
diff --git a/src/Kir/Streams/Tests/Helper/ResourceStream.php b/src/Kir/Streams/Tests/Helper/ResourceStream.php
index c19e3d8..78ccec8 100644
--- a/src/Kir/Streams/Tests/Helper/ResourceStream.php
+++ b/src/Kir/Streams/Tests/Helper/ResourceStream.php
@@ -87,13 +87,6 @@ public function write($data) {
 		$this->size = max(ftell($this->res), $this->size);
 		return $this;
 	}
-	/**
-	 * @throws IOException
-	 * @return $this
-	 */
-	public function flush() {
-		return $this;
-	}
 
 	/**
 	 * @return int