diff --git a/compiler/rustc_metadata/src/rmeta/decoder.rs b/compiler/rustc_metadata/src/rmeta/decoder.rs
index a540c4606c9..8e49ced56ef 100644
--- a/compiler/rustc_metadata/src/rmeta/decoder.rs
+++ b/compiler/rustc_metadata/src/rmeta/decoder.rs
@@ -32,7 +32,7 @@ use rustc_session::cstore::{
 use rustc_session::Session;
 use rustc_span::hygiene::{ExpnIndex, MacroKind};
 use rustc_span::source_map::{respan, Spanned};
-use rustc_span::symbol::{sym, Ident, Symbol};
+use rustc_span::symbol::{kw, sym, Ident, Symbol};
 use rustc_span::{self, BytePos, ExpnId, Pos, Span, SyntaxContext, DUMMY_SP};
 
 use proc_macro::bridge::client::ProcMacro;
@@ -1087,8 +1087,15 @@ impl<'a, 'tcx> CrateMetadataRef<'a> {
         }
     }
 
-    fn get_fn_has_self_parameter(self, id: DefIndex) -> bool {
-        self.root.tables.fn_has_self_parameter.get(self, id).is_some()
+    fn get_fn_has_self_parameter(self, id: DefIndex, sess: &'a Session) -> bool {
+        self.root
+            .tables
+            .fn_arg_names
+            .get(self, id)
+            .unwrap_or_else(LazyArray::empty)
+            .decode((self, sess))
+            .nth(0)
+            .map_or(false, |ident| ident.name == kw::SelfLower)
     }
 
     fn get_associated_item_def_ids(
@@ -1105,7 +1112,7 @@ impl<'a, 'tcx> CrateMetadataRef<'a> {
             .map(move |child_index| self.local_def_id(child_index))
     }
 
-    fn get_associated_item(self, id: DefIndex) -> ty::AssocItem {
+    fn get_associated_item(self, id: DefIndex, sess: &'a Session) -> ty::AssocItem {
         let name = self.item_name(id);
 
         let kind = match self.def_kind(id) {
@@ -1114,7 +1121,7 @@ impl<'a, 'tcx> CrateMetadataRef<'a> {
             DefKind::AssocTy => ty::AssocKind::Type,
             _ => bug!("cannot get associated-item of `{:?}`", self.def_key(id)),
         };
-        let has_self = self.get_fn_has_self_parameter(id);
+        let has_self = self.get_fn_has_self_parameter(id, sess);
         let container = self.root.tables.assoc_container.get(self, id).unwrap();
 
         ty::AssocItem {
diff --git a/compiler/rustc_metadata/src/rmeta/decoder/cstore_impl.rs b/compiler/rustc_metadata/src/rmeta/decoder/cstore_impl.rs
index 9d201a0c799..6b447ebd999 100644
--- a/compiler/rustc_metadata/src/rmeta/decoder/cstore_impl.rs
+++ b/compiler/rustc_metadata/src/rmeta/decoder/cstore_impl.rs
@@ -233,7 +233,7 @@ provide! { tcx, def_id, other, cdata,
     associated_item_def_ids => {
         tcx.arena.alloc_from_iter(cdata.get_associated_item_def_ids(def_id.index, tcx.sess))
     }
-    associated_item => { cdata.get_associated_item(def_id.index) }
+    associated_item => { cdata.get_associated_item(def_id.index, tcx.sess) }
     inherent_impls => { cdata.get_inherent_implementations_for_type(tcx, def_id.index) }
     is_foreign_item => { cdata.is_foreign_item(def_id.index) }
     item_attrs => { tcx.arena.alloc_from_iter(cdata.get_item_attrs(def_id.index, tcx.sess)) }
@@ -535,8 +535,8 @@ impl CStore {
         )
     }
 
-    pub fn fn_has_self_parameter_untracked(&self, def: DefId) -> bool {
-        self.get_crate_data(def.krate).get_fn_has_self_parameter(def.index)
+    pub fn fn_has_self_parameter_untracked(&self, def: DefId, sess: &Session) -> bool {
+        self.get_crate_data(def.krate).get_fn_has_self_parameter(def.index, sess)
     }
 
     pub fn crate_source_untracked(&self, cnum: CrateNum) -> Lrc<CrateSource> {
diff --git a/compiler/rustc_metadata/src/rmeta/encoder.rs b/compiler/rustc_metadata/src/rmeta/encoder.rs
index 1288d19cb08..578a416ce6b 100644
--- a/compiler/rustc_metadata/src/rmeta/encoder.rs
+++ b/compiler/rustc_metadata/src/rmeta/encoder.rs
@@ -1335,9 +1335,6 @@ impl<'a, 'tcx> EncodeContext<'a, 'tcx> {
                 };
                 self.tables.asyncness.set(def_id.index, m_sig.header.asyncness);
                 self.tables.constness.set(def_id.index, hir::Constness::NotConst);
-                if trait_item.fn_has_self_parameter {
-                    self.tables.fn_has_self_parameter.set(def_id.index, ());
-                }
             }
             ty::AssocKind::Type => {
                 self.encode_explicit_item_bounds(def_id);
@@ -1369,9 +1366,6 @@ impl<'a, 'tcx> EncodeContext<'a, 'tcx> {
                     hir::Constness::NotConst
                 };
                 self.tables.constness.set(def_id.index, constness);
-                if impl_item.fn_has_self_parameter {
-                    self.tables.fn_has_self_parameter.set(def_id.index, ());
-                }
             }
             ty::AssocKind::Const | ty::AssocKind::Type => {}
         }
diff --git a/compiler/rustc_metadata/src/rmeta/mod.rs b/compiler/rustc_metadata/src/rmeta/mod.rs
index bb5b40bcc5b..6f849a58580 100644
--- a/compiler/rustc_metadata/src/rmeta/mod.rs
+++ b/compiler/rustc_metadata/src/rmeta/mod.rs
@@ -398,8 +398,6 @@ define_tables! {
     macro_rules: Table<DefIndex, ()>,
     macro_definition: Table<DefIndex, LazyValue<ast::MacArgs>>,
     proc_macro: Table<DefIndex, MacroKind>,
-    // Slot is full when there is a self parameter.
-    fn_has_self_parameter: Table<DefIndex, ()>,
     module_reexports: Table<DefIndex, LazyArray<ModChild>>,
 }
 
diff --git a/compiler/rustc_resolve/src/build_reduced_graph.rs b/compiler/rustc_resolve/src/build_reduced_graph.rs
index 8f3b6009bd6..052d05974cd 100644
--- a/compiler/rustc_resolve/src/build_reduced_graph.rs
+++ b/compiler/rustc_resolve/src/build_reduced_graph.rs
@@ -1030,7 +1030,7 @@ impl<'a, 'b> BuildReducedGraphVisitor<'a, 'b> {
                 self.insert_field_names(def_id, field_names);
             }
             Res::Def(DefKind::AssocFn, def_id) => {
-                if cstore.fn_has_self_parameter_untracked(def_id) {
+                if cstore.fn_has_self_parameter_untracked(def_id, self.r.session) {
                     self.r.has_self.insert(def_id);
                 }
             }