diff --git a/src/script.h b/src/script.h
index 0d8a8544b..99724f895 100644
--- a/src/script.h
+++ b/src/script.h
@@ -207,7 +207,8 @@ static const unsigned int MANDATORY_SCRIPT_VERIFY_FLAGS = SCRIPT_VERIFY_P2SH;
 // blocks and we must accept those blocks.
 static const unsigned int STANDARD_SCRIPT_VERIFY_FLAGS = MANDATORY_SCRIPT_VERIFY_FLAGS |
                                                          SCRIPT_VERIFY_STRICTENC |
-                                                         SCRIPT_VERIFY_NULLDUMMY;
+                                                         SCRIPT_VERIFY_NULLDUMMY |
+                                                         SCRIPT_VERIFY_LOW_S;
 
 // For convenience, standard but not mandatory verify flags.
 static const unsigned int STANDARD_NOT_MANDATORY_VERIFY_FLAGS = STANDARD_SCRIPT_VERIFY_FLAGS & ~MANDATORY_SCRIPT_VERIFY_FLAGS;