diff --git a/modules/openapi-generator/src/main/java/org/openapitools/codegen/DefaultCodegen.java b/modules/openapi-generator/src/main/java/org/openapitools/codegen/DefaultCodegen.java
index 811b49c02a6..67fd4452099 100644
--- a/modules/openapi-generator/src/main/java/org/openapitools/codegen/DefaultCodegen.java
+++ b/modules/openapi-generator/src/main/java/org/openapitools/codegen/DefaultCodegen.java
@@ -1867,8 +1867,10 @@ public class DefaultCodegen implements CodegenConfig {
         discriminator.setMapping(schema.getDiscriminator().getMapping());
         if (schema.getDiscriminator().getMapping() != null && !schema.getDiscriminator().getMapping().isEmpty()) {
             for (Entry<String, String> e : schema.getDiscriminator().getMapping().entrySet()) {
-                String name = toModelName(ModelUtils.getSimpleRef(e.getValue())); // e.g e.getValue => #/components/schemas/Dog
-                discriminator.getMappedModels().add(new MappedModel(e.getKey(), name));
+                String nameOrRef = e.getValue();
+                String name = nameOrRef.indexOf('/') >= 0 ? ModelUtils.getSimpleRef(nameOrRef) : nameOrRef;
+                String modelName = toModelName(name);
+                discriminator.getMappedModels().add(new MappedModel(e.getKey(), modelName));
             }
         } else {
             Map<String, Schema> allDefinitions = ModelUtils.getSchemas(this.openAPI);
diff --git a/modules/openapi-generator/src/test/java/org/openapitools/codegen/DefaultCodegenTest.java b/modules/openapi-generator/src/test/java/org/openapitools/codegen/DefaultCodegenTest.java
index 8c2e2aabc63..a95b6f106b1 100644
--- a/modules/openapi-generator/src/test/java/org/openapitools/codegen/DefaultCodegenTest.java
+++ b/modules/openapi-generator/src/test/java/org/openapitools/codegen/DefaultCodegenTest.java
@@ -583,7 +583,7 @@ public class DefaultCodegenTest {
         test.setPropertyName("DollarUnderscoretype");
         test.setMapping(new HashMap<>());
         test.getMapping().put("a", "#/components/schemas/Adult");
-        test.getMapping().put("c", "#/components/schemas/Child");
+        test.getMapping().put("c", "Child");
         test.getMappedModels().add(new CodegenDiscriminator.MappedModel("a", "Adult"));
         test.getMappedModels().add(new CodegenDiscriminator.MappedModel("c", "Child"));
         Assert.assertEquals(discriminator, test);
diff --git a/modules/openapi-generator/src/test/resources/3_0/allOf.yaml b/modules/openapi-generator/src/test/resources/3_0/allOf.yaml
index 6f01aeb80c9..4d781cb871a 100644
--- a/modules/openapi-generator/src/test/resources/3_0/allOf.yaml
+++ b/modules/openapi-generator/src/test/resources/3_0/allOf.yaml
@@ -32,7 +32,7 @@ components:
         propertyName: $_type
         mapping:
           a: '#/components/schemas/Adult'
-          c: '#/components/schemas/Child'
+          c: Child
       properties:
         $_type:
           type: string