diff --git a/docs/generators/ruby.md b/docs/generators/ruby.md
index 59a8a701ef19..39c949860540 100644
--- a/docs/generators/ruby.md
+++ b/docs/generators/ruby.md
@@ -108,6 +108,7 @@ These options may be applied as additional-properties (cli) or configOptions (pl
 <li>next</li>
 <li>nil</li>
 <li>not</li>
+<li>object_id</li>
 <li>or</li>
 <li>post_body</li>
 <li>query_params</li>
diff --git a/modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/RubyClientCodegen.java b/modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/RubyClientCodegen.java
index d4b5e3a8b8a3..783f3c888df6 100644
--- a/modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/RubyClientCodegen.java
+++ b/modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/RubyClientCodegen.java
@@ -135,10 +135,11 @@ public RubyClientCodegen() {
         // default HIDE_GENERATION_TIMESTAMP to true
         hideGenerationTimestamp = Boolean.TRUE;
 
-        // local variable names used in API methods (endpoints)
+        // local variable names used in API methods (endpoints), plus core methods that
+        // generated model accessors must not override
         for (String word : Arrays.asList(
                 "local_var_path", "query_params", "header_params", "_header_accept", "_header_accept_result",
-                "_header_content_type", "form_params", "post_body", "auth_names", "send")) {
+                "_header_content_type", "form_params", "post_body", "auth_names", "send", "object_id")) {
             reservedWords.add(word.toLowerCase(Locale.ROOT));
         }
 
diff --git a/modules/openapi-generator/src/test/java/org/openapitools/codegen/ruby/RubyClientCodegenTest.java b/modules/openapi-generator/src/test/java/org/openapitools/codegen/ruby/RubyClientCodegenTest.java
index c688b531eec8..d866e2d65f4d 100644
--- a/modules/openapi-generator/src/test/java/org/openapitools/codegen/ruby/RubyClientCodegenTest.java
+++ b/modules/openapi-generator/src/test/java/org/openapitools/codegen/ruby/RubyClientCodegenTest.java
@@ -19,7 +19,9 @@
 
 import io.swagger.v3.oas.models.OpenAPI;
 import io.swagger.v3.oas.models.Operation;
+import io.swagger.v3.oas.models.media.ObjectSchema;
 import io.swagger.v3.oas.models.media.Schema;
+import io.swagger.v3.oas.models.media.StringSchema;
 import org.apache.commons.io.FileUtils;
 import org.openapitools.codegen.*;
 import org.openapitools.codegen.languages.RubyClientCodegen;
@@ -912,4 +914,28 @@ public void testEnumBuildFromHashRaisesByDefault() throws Exception {
                 "      raise \"Invalid ENUM value #{value} for class #Type\"\n" +
                 "    end");
     }
+
+    @Test(description = "a property named object_id must not override Object#object_id")
+    public void objectIdPropertyIsEscapedTest() throws Exception {
+        final File output = Files.createTempDirectory("test").toFile();
+        output.deleteOnExit();
+
+        final Schema schema = new ObjectSchema().addProperty("ObjectId", new StringSchema());
+        final OpenAPI openAPI = TestUtils.createOpenAPIWithOneSchema("Association", schema);
+        final RubyClientCodegen codegen = new RubyClientCodegen();
+        codegen.setOutputDir(output.getAbsolutePath());
+        codegen.setOpenAPI(openAPI);
+
+        CodegenProperty objectId = codegen.fromModel("Association", schema).getVars().get(0);
+        Assert.assertEquals(objectId.name, "_object_id");
+        Assert.assertEquals(objectId.baseName, "ObjectId");
+
+        ClientOptInput clientOptInput = new ClientOptInput().openAPI(openAPI).config(codegen);
+        new DefaultGenerator().opts(clientOptInput).generate();
+
+        Path association = new File(output, "lib/openapi_client/models/association.rb").toPath();
+        TestUtils.assertFileContains(association, "attr_accessor :_object_id");
+        TestUtils.assertFileContains(association, ":'_object_id' => :'ObjectId'");
+        TestUtils.assertFileNotContains(association, "attr_accessor :object_id");
+    }
 }