diff --git a/deflect/server/Frame.cpp b/deflect/server/Frame.cpp
index 140d044..79296de 100644
--- a/deflect/server/Frame.cpp
+++ b/deflect/server/Frame.cpp
@@ -74,5 +74,17 @@ RowOrder Frame::determineRowOrder() const
 
     return frameRowOrder;
 }
+
+std::map<uint8_t, QSize> Frame::computeChannelDimensions() const
+{
+    std::map<uint8_t, QSize> sizes;
+    for (const auto& tile : tiles)
+    {
+        auto& size = sizes[tile.channel];
+        size.setWidth(std::max(size.width(), (int)(tile.width + tile.x)));
+        size.setHeight(std::max(size.height(), (int)(tile.height + tile.y)));
+    }
+    return sizes;
+}
 }
 }
diff --git a/deflect/server/Frame.h b/deflect/server/Frame.h
index daa1971..71704ef 100644
--- a/deflect/server/Frame.h
+++ b/deflect/server/Frame.h
@@ -46,6 +46,8 @@
 #include <QSize>
 #include <QString>
 
+#include <map>
+
 namespace deflect
 {
 namespace server
@@ -64,6 +66,9 @@ struct Frame
     /** @return the total dimensions of the given channel of this frame. */
     DEFLECT_API QSize computeDimensions(const uint8_t channel = 0) const;
 
+    /** @return the total dimensions of all channels of this frame. */
+    DEFLECT_API std::map<uint8_t, QSize> computeChannelDimensions() const;
+
     /**
      * @return the row order of all frame tiles.
      * @throws std::runtime_error if not all tiles have the same RowOrder.
diff --git a/deflect/server/FrameDispatcher.cpp b/deflect/server/FrameDispatcher.cpp
index 4e6ba6d..983c58b 100644
--- a/deflect/server/FrameDispatcher.cpp
+++ b/deflect/server/FrameDispatcher.cpp
@@ -75,9 +75,9 @@ class FrameDispatcher::Impl
 
     void mirrorTilesPositionsVertically(Frame& frame) const
     {
-        const auto height = frame.computeDimensions().height();
+        const auto sizes = frame.computeChannelDimensions();
         for (auto& tile : frame.tiles)
-            tile.y = height - tile.y - tile.height;
+            tile.y = sizes.at(tile.channel).height() - tile.y - tile.height;
     }
 
     bool allConnectionsClosed(const QString& uri) const
diff --git a/doc/Changelog.md b/doc/Changelog.md
index b531602..c2cc29c 100644
--- a/doc/Changelog.md
+++ b/doc/Changelog.md
@@ -4,6 +4,8 @@ Changelog {#Changelog}
 ## Deflect 1.0
 
 ### 1.0.1 (master)
+* [207](https://github.com/BlueBrain/Deflect/pull/207):
+  Fix wrong vertical frame mirror for different sized channels
 * [203](https://github.com/BlueBrain/Deflect/pull/203):
   QmlStreamer resizes the window only if the received size event is within the
   specified min/max size hints.