diff --git a/compiler/crates/common/src/feature_flags.rs b/compiler/crates/common/src/feature_flags.rs
index adbb06c362c8d..c36274aa0aaff 100644
--- a/compiler/crates/common/src/feature_flags.rs
+++ b/compiler/crates/common/src/feature_flags.rs
@@ -27,11 +27,6 @@ pub struct FeatureFlags {
     #[serde(default)]
     pub relay_resolver_enable_output_type: FeatureFlag,
 
-    /// Enable hashing of the `supported` argument of 3D fields. Partial
-    /// enabling of the feature flag checks the name based on the field type.
-    #[serde(default)]
-    pub hash_supported_argument: FeatureFlag,
-
     /// For now, this also disallows fragments with variable definitions
     /// This also makes @module to opt in using @no_inline internally
     /// NOTE that the presence of a fragment in this list only controls whether a fragment is *allowed* to
diff --git a/compiler/crates/relay-compiler-playground/__tests__/relay_compiler_playground-test.js b/compiler/crates/relay-compiler-playground/__tests__/relay_compiler_playground-test.js
index d92792f769b9c..a0b98444195cb 100644
--- a/compiler/crates/relay-compiler-playground/__tests__/relay_compiler_playground-test.js
+++ b/compiler/crates/relay-compiler-playground/__tests__/relay_compiler_playground-test.js
@@ -139,7 +139,7 @@ describe('Err', () => {
     );
     expect(actual.Err).toEqual({
       ConfigError:
-        'unknown field `this_key_does_not_exist`, expected one of `enable_flight_transform`, `enable_relay_resolver_transform`, `hash_supported_argument`, `no_inline`, `enable_3d_branch_arg_generation`, `actor_change_support`, `text_artifacts`, `enable_provided_variables`, `skip_printing_nulls`, `enable_fragment_aliases` at line 1 column 26',
+        'unknown field `this_key_does_not_exist`, expected one of `enable_flight_transform`, `enable_relay_resolver_transform`, `no_inline`, `enable_3d_branch_arg_generation`, `actor_change_support`, `text_artifacts`, `enable_provided_variables`, `skip_printing_nulls`, `enable_fragment_aliases` at line 1 column 26',
     });
   });
   test('parse_to_ast', () => {
diff --git a/compiler/crates/relay-compiler/tests/compile_relay_artifacts/mod.rs b/compiler/crates/relay-compiler/tests/compile_relay_artifacts/mod.rs
index 9abcb9670ee00..0c117e3bfb909 100644
--- a/compiler/crates/relay-compiler/tests/compile_relay_artifacts/mod.rs
+++ b/compiler/crates/relay-compiler/tests/compile_relay_artifacts/mod.rs
@@ -100,7 +100,6 @@ pub fn transform_fixture(fixture: &Fixture<'_>) -> Result<String, String> {
     ];
 
     let feature_flags = FeatureFlags {
-        hash_supported_argument: FeatureFlag::Enabled,
         // test SplitOperations that do not use @no-inline D28460294
         no_inline: FeatureFlag::Limited {
             allowlist: no_inline_allowlist.into_iter().collect(),
diff --git a/compiler/crates/relay-compiler/tests/compile_relay_artifacts_with_custom_id/mod.rs b/compiler/crates/relay-compiler/tests/compile_relay_artifacts_with_custom_id/mod.rs
index 64a5680f297a5..3e6f50698885b 100644
--- a/compiler/crates/relay-compiler/tests/compile_relay_artifacts_with_custom_id/mod.rs
+++ b/compiler/crates/relay-compiler/tests/compile_relay_artifacts_with_custom_id/mod.rs
@@ -83,7 +83,6 @@ pub fn transform_fixture(fixture: &Fixture<'_>) -> Result<String, String> {
     let program = Program::from_definitions(Arc::clone(&schema), ir);
 
     let feature_flags = FeatureFlags {
-        hash_supported_argument: FeatureFlag::Disabled,
         no_inline: FeatureFlag::Enabled,
         enable_relay_resolver_transform: true,
         enable_3d_branch_arg_generation: true,