diff --git a/src/proc/play/dummy-image-generator.cpp b/src/proc/play/dummy-image-generator.cpp
index 250549b42..44cf97cd1 100644
--- a/src/proc/play/dummy-image-generator.cpp
+++ b/src/proc/play/dummy-image-generator.cpp
@@ -89,7 +89,7 @@ namespace proc {
     { }
     
     
-    const LumieraDisplayFrame
+    LumieraDisplayFrame
     DummyImageGenerator::next()
     {
       
@@ -156,7 +156,7 @@ namespace proc {
     }
     
     
-    const LumieraDisplayFrame
+    LumieraDisplayFrame
     DummyImageGenerator::current()
     {
       if (!current_) return outFrame_A_;
diff --git a/src/proc/play/dummy-image-generator.hpp b/src/proc/play/dummy-image-generator.hpp
index e2d70d322..c893962b8 100644
--- a/src/proc/play/dummy-image-generator.hpp
+++ b/src/proc/play/dummy-image-generator.hpp
@@ -69,11 +69,11 @@ namespace proc {
          *  occupy the alternate buffer.
          *  @return the buffer containing the new frame
          */
-        const LumieraDisplayFrame next();
+        LumieraDisplayFrame next();
         
         /** just re-return a pointer to the current frame
          *  without generating any new image data */
-        const LumieraDisplayFrame current();
+        LumieraDisplayFrame current();
       
         
       private: