diff --git a/src/core.h b/src/core.h
index 6a0286f9d..b020a365e 100644
--- a/src/core.h
+++ b/src/core.h
@@ -364,7 +364,7 @@ class CBlockHeader
 {
 public:
     // header
-    static const int CURRENT_VERSION=2;
+    static const int CURRENT_VERSION=3;
     int nVersion;
     uint256 hashPrevBlock;
     uint256 hashMerkleRoot;
diff --git a/src/script.h b/src/script.h
index 99724f895..c3bca80cf 100644
--- a/src/script.h
+++ b/src/script.h
@@ -208,6 +208,7 @@ static const unsigned int MANDATORY_SCRIPT_VERIFY_FLAGS = SCRIPT_VERIFY_P2SH;
 static const unsigned int STANDARD_SCRIPT_VERIFY_FLAGS = MANDATORY_SCRIPT_VERIFY_FLAGS |
                                                          SCRIPT_VERIFY_STRICTENC |
                                                          SCRIPT_VERIFY_NULLDUMMY |
+                                                         SCRIPT_VERIFY_DERSIG |
                                                          SCRIPT_VERIFY_LOW_S;
 
 // For convenience, standard but not mandatory verify flags.