diff --git a/CHANGELOG.md b/CHANGELOG.md
index b015809a66..9e42c58dd0 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -14,6 +14,8 @@ app.
   thanks to [@maiself](https://github.com/maiself)
   ([#2014](https://github.com/birchill/10ten-ja-reader/pull/2014)).
 - Added handling for 戶 and 內 kyūjitai.
+- Added deinflection for additional forms of -sugiru
+  ([#2033](https://github.com/birchill/10ten-ja-reader/pull/2033)).
 - Fixed unreasonable matches caused by duplicates in the deinflection reason chain
   ([#1966](https://github.com/birchill/10ten-ja-reader/issues/1966)).
 - Fixed sorting of deinflected results in some cases (e.g. 見とれる).
diff --git a/src/background/deinflect.ts b/src/background/deinflect.ts
index 4f99ec8015..b1d145a5df 100644
--- a/src/background/deinflect.ts
+++ b/src/background/deinflect.ts
@@ -200,6 +200,8 @@ const deinflectRuleData: Array<
   ['じゃう', '', Type.GodanVerb, Type.DaDeStem, [Reason.Chau]],
   ['すぎる', 'い', Type.IchidanVerb, Type.IAdj, [Reason.Sugiru]],
   ['すぎる', '', Type.IchidanVerb, Type.MasuStem, [Reason.Sugiru]],
+  ['過ぎる', 'い', Type.IchidanVerb, Type.IAdj, [Reason.Sugiru]],
+  ['過ぎる', '', Type.IchidanVerb, Type.MasuStem, [Reason.Sugiru]],
   ['たまう', 'たまう', Type.TaTeStem, Type.GodanVerb, []],
   ['たもう', 'たもう', Type.TaTeStem, Type.GodanVerb, []],
   ['揺蕩う', '揺蕩う', Type.TaTeStem, Type.GodanVerb, []],
@@ -239,6 +241,10 @@ const deinflectRuleData: Array<
   ['ごう', 'ぐ', Type.Initial, Type.GodanVerb, [Reason.Volitional]],
   ['しろ', 'す', Type.Initial, Type.SuruVerb, [Reason.Imperative]],
   ['しろ', 'する', Type.Initial, Type.SuruVerb, [Reason.Imperative]],
+  ['すぎ', 'い', Type.Initial, Type.IAdj, [Reason.Sugiru]],
+  ['すぎ', '', Type.Initial, Type.MasuStem, [Reason.Sugiru]],
+  ['過ぎ', 'い', Type.Initial, Type.IAdj, [Reason.Sugiru]],
+  ['過ぎ', '', Type.Initial, Type.MasuStem, [Reason.Sugiru]],
   ['する', '', Type.SuruVerb, Type.NounVS, [Reason.SuruNoun]],
   ['せず', 'する', Type.Initial, Type.SuruVerb, [Reason.Zu]],
   ['せぬ', 'する', Type.Initial, Type.SuruVerb, [Reason.Negative]],