diff --git a/lib/ruby_lsp/global_state.rb b/lib/ruby_lsp/global_state.rb
index df0eee261..004df40d9 100644
--- a/lib/ruby_lsp/global_state.rb
+++ b/lib/ruby_lsp/global_state.rb
@@ -146,7 +146,7 @@ def apply_options(options)
 
     sig { params(flag: Symbol).returns(T.nilable(T::Boolean)) }
     def enabled_feature?(flag)
-      @enabled_feature_flags[flag]
+      @enabled_feature_flags[:all] || @enabled_feature_flags[flag]
     end
 
     sig { returns(String) }
diff --git a/test/global_state_test.rb b/test/global_state_test.rb
index 02dc0ee66..b655dcbfe 100644
--- a/test/global_state_test.rb
+++ b/test/global_state_test.rb
@@ -235,6 +235,20 @@ def test_feature_flags_are_processed_by_apply_options
       assert_nil(state.enabled_feature?(:unknown_flag))
     end
 
+    def test_enabled_feature_always_returns_true_if_all_are_enabled
+      state = GlobalState.new
+
+      state.apply_options({
+        initializationOptions: {
+          enabledFeatureFlags: {
+            all: true,
+          },
+        },
+      })
+
+      assert(state.enabled_feature?(:whatever))
+    end
+
     private
 
     def stub_direct_dependencies(dependencies)