diff --git a/src/engine/dispatchContainer.cpp b/src/engine/dispatchContainer.cpp
index 3ff58e30e..6a532548b 100644
--- a/src/engine/dispatchContainer.cpp
+++ b/src/engine/dispatchContainer.cpp
@@ -172,6 +172,7 @@ void DivDispatchContainer::fillBuf(size_t runtotal, size_t offset, size_t size)
       if (bbIn[i]==NULL) continue;
       if (bb[i]==NULL) continue;
       for (size_t j=0; j<runtotal; j++) {
+        if (bbIn[i][j]==temp[i]) continue;
         temp[i]=bbIn[i][j];
         blip_add_delta_fast(bb[i],j,temp[i]-prevSample[i]);
         prevSample[i]=temp[i];
@@ -182,6 +183,7 @@ void DivDispatchContainer::fillBuf(size_t runtotal, size_t offset, size_t size)
       if (bbIn[i]==NULL) continue;
       if (bb[i]==NULL) continue;
       for (size_t j=0; j<runtotal; j++) {
+        if (bbIn[i][j]==temp[i]) continue;
         temp[i]=bbIn[i][j];
         blip_add_delta(bb[i],j,temp[i]-prevSample[i]);
         prevSample[i]=temp[i];