diff --git a/CHANGES.txt b/CHANGES.txt
index fcccccdb72..7823f87a70 100644
--- a/CHANGES.txt
+++ b/CHANGES.txt
@@ -23,6 +23,7 @@
  * (cqlsh) Improve waiting for a trace to complete (CASSANDRA-7626)
  * Fix tracing of concurrent range slices and 2ary index queries (CASSANDRA-7626)
 Merged from 2.0:
+ * Always flush on truncate (CASSANDRA-7511)
  * Fix ReversedType(DateType) mapping to native protocol (CASSANDRA-7576)
  * Always merge ranges owned by a single node (CASSANDRA-6930)
  * Track max/min timestamps for range tombstones (CASSANDRA-7647)
diff --git a/src/java/org/apache/cassandra/config/DatabaseDescriptor.java b/src/java/org/apache/cassandra/config/DatabaseDescriptor.java
index d89967d8e1..8d47b49516 100644
--- a/src/java/org/apache/cassandra/config/DatabaseDescriptor.java
+++ b/src/java/org/apache/cassandra/config/DatabaseDescriptor.java
@@ -1223,6 +1223,11 @@ public class DatabaseDescriptor
         return conf.auto_snapshot;
     }
 
+    @VisibleForTesting
+    public static void setAutoSnapshot(boolean autoSnapshot) {
+        conf.auto_snapshot = autoSnapshot;
+    }
+
     public static boolean isAutoBootstrap()
     {
         return conf.auto_bootstrap;
diff --git a/src/java/org/apache/cassandra/db/ColumnFamilyStore.java b/src/java/org/apache/cassandra/db/ColumnFamilyStore.java
index 8e7bdeb4f0..a1220dfe55 100644
--- a/src/java/org/apache/cassandra/db/ColumnFamilyStore.java
+++ b/src/java/org/apache/cassandra/db/ColumnFamilyStore.java
@@ -2420,25 +2420,12 @@ public class ColumnFamilyStore implements ColumnFamilyStoreMBean
         // position in the System keyspace.
         logger.debug("truncating {}", name);
 
-        if (DatabaseDescriptor.isAutoSnapshot())
-        {
-            // flush the CF being truncated before forcing the new segment
-            forceBlockingFlush();
+        // flush the CF being truncated before forcing the new segment
+        forceBlockingFlush();
 
-            // sleep a little to make sure that our truncatedAt comes after any sstable
-            // that was part of the flushed we forced; otherwise on a tie, it won't get deleted.
-            Uninterruptibles.sleepUninterruptibly(1, TimeUnit.MILLISECONDS);
-        }
-        else
-        {
-            // just nuke the memtable data w/o writing to disk first
-            synchronized (data)
-            {
-                final Flush flush = new Flush(true);
-                flushExecutor.execute(flush);
-                postFlushExecutor.submit(flush.postFlush);
-            }
-        }
+        // sleep a little to make sure that our truncatedAt comes after any sstable
+        // that was part of the flushed we forced; otherwise on a tie, it won't get deleted.
+        Uninterruptibles.sleepUninterruptibly(1, TimeUnit.MILLISECONDS);
 
         Runnable truncateRunnable = new Runnable()
         {
diff --git a/test/conf/cassandra.yaml b/test/conf/cassandra.yaml
index 43995e6e75..ec988e299f 100644
--- a/test/conf/cassandra.yaml
+++ b/test/conf/cassandra.yaml
@@ -6,6 +6,7 @@ cluster_name: Test Cluster
 memtable_allocation_type: offheap_objects
 commitlog_sync: batch
 commitlog_sync_batch_window_in_ms: 1.0
+commitlog_segment_size_in_mb: 5
 partitioner: org.apache.cassandra.dht.ByteOrderedPartitioner
 listen_address: 127.0.0.1
 storage_port: 7010
diff --git a/test/unit/org/apache/cassandra/db/CommitLogTest.java b/test/unit/org/apache/cassandra/db/CommitLogTest.java
index 7046536948..a58549a12c 100644
--- a/test/unit/org/apache/cassandra/db/CommitLogTest.java
+++ b/test/unit/org/apache/cassandra/db/CommitLogTest.java
@@ -22,6 +22,7 @@ package org.apache.cassandra.db;
 import java.io.*;
 import java.nio.ByteBuffer;
 import java.util.UUID;
+import java.util.concurrent.ExecutionException;
 import java.util.concurrent.TimeUnit;
 import java.util.zip.CRC32;
 import java.util.zip.Checksum;
@@ -36,10 +37,12 @@ import org.apache.cassandra.config.Config;
 import org.apache.cassandra.config.DatabaseDescriptor;
 import org.apache.cassandra.db.commitlog.CommitLog;
 import org.apache.cassandra.db.commitlog.CommitLogDescriptor;
+import org.apache.cassandra.db.commitlog.ReplayPosition;
 import org.apache.cassandra.db.commitlog.CommitLogSegment;
 import org.apache.cassandra.db.composites.CellName;
 import org.apache.cassandra.net.MessagingService;
 import org.apache.cassandra.service.StorageService;
+import org.apache.cassandra.utils.FBUtilities;
 
 import static org.apache.cassandra.utils.ByteBufferUtil.bytes;
 
@@ -295,4 +298,33 @@ public class CommitLogTest extends SchemaLoader
         }
     }
 
+    @Test
+    public void testTruncateWithoutSnapshot()  throws ExecutionException, InterruptedException
+    {
+        CommitLog.instance.resetUnsafe();
+        boolean prev = DatabaseDescriptor.isAutoSnapshot();
+        DatabaseDescriptor.setAutoSnapshot(false);
+        ColumnFamilyStore cfs1 = Keyspace.open("Keyspace1").getColumnFamilyStore("Standard1");
+        ColumnFamilyStore cfs2 = Keyspace.open("Keyspace1").getColumnFamilyStore("Standard2");
+
+        final Mutation rm1 = new Mutation("Keyspace1", bytes("k"));
+        rm1.add("Standard1", Util.cellname("c1"), ByteBuffer.allocate(100), 0);
+        rm1.apply();
+        cfs1.truncateBlocking();
+        DatabaseDescriptor.setAutoSnapshot(prev);
+        final Mutation rm2 = new Mutation("Keyspace1", bytes("k"));
+        rm2.add("Standard2", Util.cellname("c1"), ByteBuffer.allocate(DatabaseDescriptor.getCommitLogSegmentSize() / 4), 0);
+
+        for (int i = 0 ; i < 5 ; i++)
+            CommitLog.instance.add(rm2);
+
+        Assert.assertEquals(2, CommitLog.instance.activeSegments());
+        ReplayPosition position = CommitLog.instance.getContext();
+        for (Keyspace ks : Keyspace.system())
+            for (ColumnFamilyStore syscfs : ks.getColumnFamilyStores())
+                CommitLog.instance.discardCompletedSegments(syscfs.metadata.cfId, position);
+        CommitLog.instance.discardCompletedSegments(cfs2.metadata.cfId, position);
+        Assert.assertEquals(1, CommitLog.instance.activeSegments());
+    }
+
 }