diff --git a/grammars/csharp.tmLanguage b/grammars/csharp.tmLanguage
index 3906d58..8c01b55 100644
--- a/grammars/csharp.tmLanguage
+++ b/grammars/csharp.tmLanguage
@@ -2109,13 +2109,18 @@
           </dict>
           <dict>
             <key>begin</key>
-            <string>\b(get)\b\s*(?=\{|;|=&gt;|//|/\*|$)</string>
+            <string>(?:\b(readonly)\s+)?\b(get)\b\s*(?=\{|;|=&gt;|//|/\*|$)</string>
             <key>beginCaptures</key>
             <dict>
               <key>1</key>
               <dict>
                 <key>name</key>
-                <string>storage.type.accessor.$1.cs</string>
+                <string>storage.modifier.readonly.cs</string>
+              </dict>
+              <key>2</key>
+              <dict>
+                <key>name</key>
+                <string>storage.type.accessor.get.cs</string>
               </dict>
             </dict>
             <key>end</key>
diff --git a/grammars/csharp.tmLanguage.cson b/grammars/csharp.tmLanguage.cson
index 0fb74a7..1ddb83f 100644
--- a/grammars/csharp.tmLanguage.cson
+++ b/grammars/csharp.tmLanguage.cson
@@ -1361,10 +1361,12 @@ repository:
         match: "\\b(private|protected|internal)\\b"
       }
       {
-        begin: "\\b(get)\\b\\s*(?=\\{|;|=>|//|/\\*|$)"
+        begin: "(?:\\b(readonly)\\s+)?\\b(get)\\b\\s*(?=\\{|;|=>|//|/\\*|$)"
         beginCaptures:
           "1":
-            name: "storage.type.accessor.$1.cs"
+            name: "storage.modifier.readonly.cs"
+          "2":
+            name: "storage.type.accessor.get.cs"
         end: "(?<=\\}|;)|(?=\\})"
         patterns: [
           {
diff --git a/src/csharp.tmLanguage.yml b/src/csharp.tmLanguage.yml
index 4576f37..b2db184 100644
--- a/src/csharp.tmLanguage.yml
+++ b/src/csharp.tmLanguage.yml
@@ -773,9 +773,10 @@ repository:
     - include: '#attribute-section'
     - name: storage.modifier.$1.cs
       match: \b(private|protected|internal)\b
-    - begin: \b(get)\b\s*(?=\{|;|=>|//|/\*|$)
+    - begin: (?:\b(readonly)\s+)?\b(get)\b\s*(?=\{|;|=>|//|/\*|$)
       beginCaptures:
-        '1': { name: storage.type.accessor.$1.cs }
+        '1': { name: storage.modifier.readonly.cs }
+        '2': { name: storage.type.accessor.get.cs }
       end: (?<=\}|;)|(?=\})
       patterns:
       - include: '#accessor-getter'
diff --git a/test/property.tests.ts b/test/property.tests.ts
index fda76e2..bdb7115 100644
--- a/test/property.tests.ts
+++ b/test/property.tests.ts
@@ -503,5 +503,71 @@ int Property // comment
                 Token.Punctuation.CloseBrace,
             ]);
         });
+
+        it("readonly getter (expression body)", async () => {
+            const input = Input.InClass(`
+public int this[int i]
+{
+    readonly get => counter;
+    set { }
+}`);
+            const tokens = await tokenize(input, "meta.accessor.");
+
+            tokens.should.deep.equal([
+                Token.Keyword.Modifier.Public,
+                Token.PrimitiveType.Int,
+                Token.Variable.This,
+                Token.Punctuation.OpenBracket,
+                Token.PrimitiveType.Int,
+                Token.Identifier.ParameterName("i"),
+                Token.Punctuation.CloseBracket,
+                Token.Punctuation.OpenBrace,
+                Token.Keyword.Modifier.ReadOnly,
+                Token.Keyword.Definition.Get,
+                Token.Operator.Arrow,
+                ...Scope.Accessor.Getter(
+                    Token.Variable.ReadWrite("counter"),
+                ),
+                Token.Punctuation.Semicolon,
+                Token.Keyword.Definition.Set,
+                Token.Punctuation.OpenBrace,
+                Token.Punctuation.CloseBrace,
+                Token.Punctuation.CloseBrace]);
+        });
+
+        it("readonly getter (block body)", async () => {
+            const input = Input.InClass(`
+public int Counter
+{
+    readonly get { return counter; }
+    set { counter = value; }
+}`);
+            const tokens = await tokenize(input, "meta.accessor.");
+
+            tokens.should.deep.equal([
+                Token.Keyword.Modifier.Public,
+                Token.PrimitiveType.Int,
+                Token.Identifier.PropertyName("Counter"),
+                Token.Punctuation.OpenBrace,
+                Token.Keyword.Modifier.ReadOnly,
+                Token.Keyword.Definition.Get,
+                Token.Punctuation.OpenBrace,
+                ...Scope.Accessor.Getter(
+                    Token.Keyword.Flow.Return,
+                    Token.Variable.ReadWrite("counter"),
+                    Token.Punctuation.Semicolon,
+                ),
+                Token.Punctuation.CloseBrace,
+                Token.Keyword.Definition.Set,
+                Token.Punctuation.OpenBrace,
+                ...Scope.Accessor.Setter(
+                    Token.Variable.ReadWrite("counter"),
+                    Token.Operator.Assignment,
+                    Token.Variable.Value,
+                    Token.Punctuation.Semicolon,
+                ),
+                Token.Punctuation.CloseBrace,
+                Token.Punctuation.CloseBrace]);
+        });
     });
 });