diff --git a/moose-core/biophysics/DifBuffer.cpp b/moose-core/biophysics/DifBuffer.cpp
index 5b460fd1b906efbe4d4eca39465508d2f345aa21..edf8966e2771c6c76b663798e5230d26cfb3f74a 100644
--- a/moose-core/biophysics/DifBuffer.cpp
+++ b/moose-core/biophysics/DifBuffer.cpp
@@ -381,7 +381,8 @@ void DifBuffer::vProcess( const Eref & e, ProcPtr p )
   prevFree_ = bFree_;
   prevBound_ = bBound_;
  
-
+  Af_ = 0;
+  Bf_= 0;
   /**
    * Send ion concentration to ion buffers. They will send back information on
    * the reaction (forward / backward rates ; free / bound buffer concentration)