diff --git a/src/snapshotmanager.cpp b/src/snapshotmanager.cpp
--- a/src/snapshotmanager.cpp
+++ b/src/snapshotmanager.cpp
@@ -1,5 +1,5 @@
 /*
-  Copyright © 2018 Hasan Yavuz Özderya
+  Copyright © 2019 Hasan Yavuz Özderya
 
   This file is part of serialplot.
 
@@ -71,6 +71,7 @@ Snapshot* SnapshotManager::makeSnapshot(
 
     for (unsigned ci = 0; ci < _stream->numChannels(); ci++)
     {
+        snapshot->xData.append(new IndexBuffer(_stream->numSamples()));
         snapshot->yData.append(new ReadOnlyBuffer(_stream->channel(ci)->yData()));
     }
 
@@ -156,8 +157,16 @@ void SnapshotManager::loadSnapshotFromFi
     QTextStream ts(&file);
     QString line;
     unsigned lineNum = 1;
+
+#if QT_VERSION >= QT_VERSION_CHECK(5, 5, 0)
     while (ts.readLineInto(&line))
     {
+#else
+    while (true)
+    {
+        line = ts.readLine();
+        if (line.isNull()) break;
+#endif
         // parse line
         auto split = line.split(',');
 
@@ -194,6 +203,7 @@ void SnapshotManager::loadSnapshotFromFi
 
     for (unsigned ci = 0; ci < numOfChannels; ci++)
     {
+        snapshot->xData.append(new IndexBuffer(data[ci].size()));
         snapshot->yData.append(new ReadOnlyBuffer(data[ci].data(), data[ci].size()));
     }