diff --git a/proto/anki/config.proto b/proto/anki/config.proto
index ea115f0fc..1fe7011f8 100644
--- a/proto/anki/config.proto
+++ b/proto/anki/config.proto
@@ -57,6 +57,7 @@ message ConfigKey {
     LOAD_BALANCER_ENABLED = 26;
     FSRS_SHORT_TERM_WITH_STEPS_ENABLED = 27;
     FSRS_LEGACY_EVALUATE = 28;
+    FSRS = 29;
   }
   enum String {
     SET_DUE_BROWSER = 0;
diff --git a/pylib/tests/test_schedv3.py b/pylib/tests/test_schedv3.py
index a71fa7140..3021aca65 100644
--- a/pylib/tests/test_schedv3.py
+++ b/pylib/tests/test_schedv3.py
@@ -10,6 +10,7 @@ from typing import Dict
 import pytest
 
 from anki import hooks
+from anki.config import Config
 from anki.consts import *
 from anki.lang import without_unicode_isolation
 from anki.scheduler import UnburyDeck
@@ -19,6 +20,8 @@ from tests.shared import getEmptyCol as getEmptyColOrig
 
 def getEmptyCol():
     col = getEmptyColOrig()
+    # Disable FSRS for legacy scheduler tests
+    col.set_config_bool(Config.Bool.FSRS, False, undoable=False)
     return col
 
 
diff --git a/rslib/src/backend/config.rs b/rslib/src/backend/config.rs
index b6e81ce2a..3d86dfc9b 100644
--- a/rslib/src/backend/config.rs
+++ b/rslib/src/backend/config.rs
@@ -40,6 +40,7 @@ impl From<BoolKeyProto> for BoolKey {
             BoolKeyProto::LoadBalancerEnabled => BoolKey::LoadBalancerEnabled,
             BoolKeyProto::FsrsShortTermWithStepsEnabled => BoolKey::FsrsShortTermWithStepsEnabled,
             BoolKeyProto::FsrsLegacyEvaluate => BoolKey::FsrsLegacyEvaluate,
+            BoolKeyProto::Fsrs => BoolKey::Fsrs,
         }
     }
 }