diff --git a/src/engine/engine.cpp b/src/engine/engine.cpp
index 323463f9..4f2c3a04 100644
--- a/src/engine/engine.cpp
+++ b/src/engine/engine.cpp
@@ -3351,6 +3351,7 @@ bool DivEngine::moveSampleUp(int which) {
   song.sample[which]=song.sample[which-1];
   song.sample[which-1]=prev;
   saveLock.unlock();
+  renderSamples();
   BUSY_END;
   return true;
 }
@@ -3376,7 +3377,6 @@ bool DivEngine::moveWaveDown(int which) {
   song.wave[which]=song.wave[which+1];
   song.wave[which+1]=prev;
   saveLock.unlock();
-  renderSamples();
   BUSY_END;
   return true;
 }