diff --git a/src/main/java/com/github/sylvainjuge/memoryfs/MemoryByteChannel.java b/src/main/java/com/github/sylvainjuge/memoryfs/MemoryByteChannel.java
index 498f8aa..34dc6e8 100644
--- a/src/main/java/com/github/sylvainjuge/memoryfs/MemoryByteChannel.java
+++ b/src/main/java/com/github/sylvainjuge/memoryfs/MemoryByteChannel.java
@@ -116,7 +116,18 @@ public boolean isOpen() {
 
     @Override
     public void close() throws IOException {
-        checkOpen();
+        if (! open) {
+          return;
+        }
+        
+        if (writeChannel != null) {
+          writeChannel.close();
+        }
+        
+        if (readChannel != null) {
+          readChannel.close();
+        }
+        
         this.open = false;
     }
 
diff --git a/src/test/java/com/github/sylvainjuge/memoryfs/MemoryByteChannelTest.java b/src/test/java/com/github/sylvainjuge/memoryfs/MemoryByteChannelTest.java
index 5202ccb..3c24da8 100644
--- a/src/test/java/com/github/sylvainjuge/memoryfs/MemoryByteChannelTest.java
+++ b/src/test/java/com/github/sylvainjuge/memoryfs/MemoryByteChannelTest.java
@@ -52,11 +52,14 @@ public void openCloseChannel() throws IOException {
         assertThat(c.isOpen()).isFalse();
     }
 
-    @Test(expectedExceptions = ClosedChannelException.class)
-    public void closeTwice() throws IOException {
+    @Test
+    public void closeTwiceShouldBeFine() throws IOException {
         MemoryByteChannel c = newReadChannel(FileData.newEmpty());
+        assertThat(c.isOpen()).isTrue();
         c.close();
+        assertThat(c.isOpen()).isFalse();
         c.close();
+        assertThat(c.isOpen()).isFalse();
     }
 
     @Test(expectedExceptions = ClosedChannelException.class)