diff --git a/src/clientversion.h b/src/clientversion.h
index 427dd2fffe..3201775706 100644
--- a/src/clientversion.h
+++ b/src/clientversion.h
@@ -9,7 +9,7 @@
 #define CLIENT_VERSION_MAJOR       0
 #define CLIENT_VERSION_MINOR       9
 #define CLIENT_VERSION_REVISION    12
-#define CLIENT_VERSION_BUILD       10
+#define CLIENT_VERSION_BUILD       11
 
 // Set to true for release, false for prerelease or test build
 #define CLIENT_VERSION_IS_RELEASE  true
diff --git a/src/main.cpp b/src/main.cpp
index e40d5cca58..a49763f00a 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -2635,7 +2635,7 @@ bool CBlock::AcceptBlock(CValidationState &state, CDiskBlockPos *dbp)
                 double n1 = ConvertBitsToDouble(nBits);
                 double n2 = ConvertBitsToDouble(nBitsNext);
 
-                if (abs(n1-n2) > n1*0.2) 
+                if (abs(n1-n2) > n1*0.5) 
                     return state.DoS(100, error("AcceptBlock() : incorrect proof of work (DGW pre-fork) - %f", abs(n1-n2)));
             } else {
                 if (nBits != GetNextWorkRequired(pindexPrev, this))