diff --git a/src/chunkedbuffer.cpp b/src/chunkedbuffer.cpp
--- a/src/chunkedbuffer.cpp
+++ b/src/chunkedbuffer.cpp
@@ -58,6 +58,22 @@ void ChunkedBuffer::addSamples(double* s
     _size += size;
 }
 
+void ChunkedBuffer::clear()
+{
+    // delete all chunks
+    for (auto chunk : chunks)
+    {
+        delete chunk;
+    }
+    chunks.clear();
+
+    numChunks = 0;
+    _size = 0;
+
+    // create first chunk
+    addNewChunk();
+}
+
 DataChunk* ChunkedBuffer::addNewChunk()
 {
     auto chunk = new DataChunk(_size, CHUNK_SIZE);
diff --git a/tests/test.cpp b/tests/test.cpp
--- a/tests/test.cpp
+++ b/tests/test.cpp
@@ -116,9 +116,9 @@ TEST_CASE("ChunkedBuffer adding data and
     REQUIRE(b.size() == CHUNK_SIZE*4);
     REQUIRE(b.boundingRect() == QRectF(0,10,CHUNK_SIZE*4,10));
 
-    // TODO: clear
-    // b.clear();
-    // REQUIRE(b.size() == 0);
+    // clear
+    b.clear();
+    REQUIRE(b.size() == 0);
 }
 
 TEST_CASE("ChunkedBuffer accessing data", "[memory]")