diff --git a/Source/Lib/Codec/EbPictureDecisionProcess.c b/Source/Lib/Codec/EbPictureDecisionProcess.c
index 6b9863408..9bc951184 100644
--- a/Source/Lib/Codec/EbPictureDecisionProcess.c
+++ b/Source/Lib/Codec/EbPictureDecisionProcess.c
@@ -1020,9 +1020,14 @@ void* PictureDecisionKernel(void *inputPtr)
 
                         pictureControlSetPtr->disableTmvpFlag = sequenceControlSetPtr->staticConfig.unrestrictedMotionVector == 0 ? EB_TRUE : EB_FALSE;
 
+                        // FIXME: work around the increased BDBR regression issue induced by the
+                        // tile group implementation (PR #348), when ImproveSharpness is used.
+#if 0
                         pictureControlSetPtr->useSrcRef = (sequenceControlSetPtr->staticConfig.improveSharpness && pictureControlSetPtr->temporalLayerIndex > 0) ?
                             EB_TRUE :
                             EB_FALSE;
+#endif
+                        pictureControlSetPtr->useSrcRef = EB_FALSE;
 
                         SignalDerivationMultiProcessesOq(
                                 sequenceControlSetPtr,