diff --git a/src/rpcmining.cpp b/src/rpcmining.cpp
index 5df5de66d..f1c401657 100644
--- a/src/rpcmining.cpp
+++ b/src/rpcmining.cpp
@@ -44,7 +44,7 @@ Value GetNetworkHashPS(int lookup, int height) {
 
     // If lookup is -1, then use blocks since last difficulty change.
     if (lookup <= 0)
-        lookup = pb->nHeight % 2016 + 1;
+        lookup = pb->nHeight % Params().Interval() + 1;
 
     // If lookup is larger than chain, then set it to chain length.
     if (lookup > pb->nHeight)