diff --git a/src/policy/policy.h b/src/policy/policy.h
--- a/src/policy/policy.h
+++ b/src/policy/policy.h
@@ -93,8 +93,7 @@
     SCRIPT_VERIFY_SIGPUSHONLY | SCRIPT_VERIFY_MINIMALDATA |
     SCRIPT_VERIFY_DISCOURAGE_UPGRADABLE_NOPS | SCRIPT_VERIFY_CLEANSTACK |
     SCRIPT_VERIFY_CHECKLOCKTIMEVERIFY | SCRIPT_VERIFY_CHECKSEQUENCEVERIFY |
-    SCRIPT_VERIFY_CHECKDATASIG_SIGOPS | SCRIPT_DISALLOW_SEGWIT_RECOVERY |
-    SCRIPT_VERIFY_INPUT_SIGCHECKS;
+    SCRIPT_DISALLOW_SEGWIT_RECOVERY | SCRIPT_VERIFY_INPUT_SIGCHECKS;
 
 /**
  * For convenience, standard but not mandatory verify flags.
diff --git a/src/script/script_flags.h b/src/script/script_flags.h
--- a/src/script/script_flags.h
+++ b/src/script/script_flags.h
@@ -88,11 +88,6 @@
     //
     SCRIPT_ENABLE_REPLAY_PROTECTION = (1U << 17),
 
-    // Count sigops for OP_CHECKDATASIG and variant. The interpreter treats
-    // OP_CHECKDATASIG(VERIFY) as always valid. This flag only affects sigops
-    // counting, and will be removed during cleanup of the SigChecks upgrade.
-    SCRIPT_VERIFY_CHECKDATASIG_SIGOPS = (1U << 18),
-
     // The exception to CLEANSTACK and P2SH for the recovery of coins sent
     // to p2sh segwit addresses is not allowed.
     SCRIPT_DISALLOW_SEGWIT_RECOVERY = (1U << 20),
diff --git a/src/test/checkdatasig_tests.cpp b/src/test/checkdatasig_tests.cpp
--- a/src/test/checkdatasig_tests.cpp
+++ b/src/test/checkdatasig_tests.cpp
@@ -65,24 +65,14 @@
                                        const CScript &script,
                                        const stacktype &expected) {
     for (uint32_t flags : flagset) {
-        // The script executes as expected regardless of whether or not
-        // SCRIPT_VERIFY_CHECKDATASIG_SIGOPS flag is passed.
-        CheckPass(flags & ~SCRIPT_VERIFY_CHECKDATASIG_SIGOPS, original_stack,
-                  script, expected);
-        CheckPass(flags | SCRIPT_VERIFY_CHECKDATASIG_SIGOPS, original_stack,
-                  script, expected);
+        CheckPass(flags, original_stack, script, expected);
     }
 }
 
 static void CheckErrorForAllFlags(const stacktype &original_stack,
                                   const CScript &script, ScriptError expected) {
     for (uint32_t flags : flagset) {
-        // The script generates the proper error regardless of whether or not
-        // SCRIPT_VERIFY_CHECKDATASIG_SIGOPS flag is passed.
-        CheckError(flags & ~SCRIPT_VERIFY_CHECKDATASIG_SIGOPS, original_stack,
-                   script, expected);
-        CheckError(flags | SCRIPT_VERIFY_CHECKDATASIG_SIGOPS, original_stack,
-                   script, expected);
+        CheckError(flags, original_stack, script, expected);
     }
 }
 
@@ -235,9 +225,4 @@
     }
 }
 
-BOOST_AUTO_TEST_CASE(checkdatasig_sigops_inclusion_in_standard_flags) {
-    BOOST_CHECK(STANDARD_SCRIPT_VERIFY_FLAGS &
-                SCRIPT_VERIFY_CHECKDATASIG_SIGOPS);
-}
-
 BOOST_AUTO_TEST_SUITE_END()
diff --git a/src/test/data/script_tests.json b/src/test/data/script_tests.json
--- a/src/test/data/script_tests.json
+++ b/src/test/data/script_tests.json
@@ -1198,7 +1198,7 @@
 [
 	"0x09 0x300702010102020001 0",
 	"0x21 0x038282263212c609d9ea2a6e3e172de238d8c39cabd5ac1ca10646e23fd5f51508 CHECKDATASIG",
-	"P2SH,STRICTENC,NULLFAIL,CHECKDATASIG",
+	"P2SH,STRICTENC,NULLFAIL",
 	"SIG_DER", "Non canonical DER encoding"
 ],
 
@@ -1239,7 +1239,7 @@
 [
 	"0x09 0x300702010102020001 0",
 	"0x21 0x038282263212c609d9ea2a6e3e172de238d8c39cabd5ac1ca10646e23fd5f51508 CHECKDATASIGVERIFY 1",
-	"P2SH,STRICTENC,NULLFAIL,CHECKDATASIG",
+	"P2SH,STRICTENC,NULLFAIL",
 	"SIG_DER", "Non canonical DER encoding"
 ],
 
diff --git a/src/test/scriptflags.cpp b/src/test/scriptflags.cpp
--- a/src/test/scriptflags.cpp
+++ b/src/test/scriptflags.cpp
@@ -29,7 +29,6 @@
     {"CHECKSEQUENCEVERIFY", SCRIPT_VERIFY_CHECKSEQUENCEVERIFY},
     {"SIGHASH_FORKID", SCRIPT_ENABLE_SIGHASH_FORKID},
     {"REPLAY_PROTECTION", SCRIPT_ENABLE_REPLAY_PROTECTION},
-    {"CHECKDATASIG", SCRIPT_VERIFY_CHECKDATASIG_SIGOPS},
     {"DISALLOW_SEGWIT_RECOVERY", SCRIPT_DISALLOW_SEGWIT_RECOVERY},
     {"SCHNORR_MULTISIG", SCRIPT_ENABLE_SCHNORR_MULTISIG},
     {"INPUT_SIGCHECKS", SCRIPT_VERIFY_INPUT_SIGCHECKS},
diff --git a/src/validation.cpp b/src/validation.cpp
--- a/src/validation.cpp
+++ b/src/validation.cpp
@@ -1574,7 +1574,6 @@
     // alternative. We also start enforcing push only signatures and
     // clean stack.
     if (IsMagneticAnomalyEnabled(params, pindex)) {
-        flags |= SCRIPT_VERIFY_CHECKDATASIG_SIGOPS;
         flags |= SCRIPT_VERIFY_SIGPUSHONLY;
         flags |= SCRIPT_VERIFY_CLEANSTACK;
     }