diff --git a/src/rpcblockchain.cpp b/src/rpcblockchain.cpp
index 8493b42a4ae6..b21a99499ea4 100644
--- a/src/rpcblockchain.cpp
+++ b/src/rpcblockchain.cpp
@@ -38,12 +38,12 @@ double GetDifficulty(const CBlockIndex* blockindex)
     double dDiff =
         (double)0x0000ffff / (double)(blockindex->nBits & 0x00ffffff);
 
-    while (nShift < 29)
+    while (nShift < 30)
     {
         dDiff *= 256.0;
         nShift++;
     }
-    while (nShift > 29)
+    while (nShift > 30)
     {
         dDiff /= 256.0;
         nShift--;