diff --git a/library/src/main/scala/za/co/absa/springdocopenapiscala/OpenAPIModelRegistration.scala b/library/src/main/scala/za/co/absa/springdocopenapiscala/OpenAPIModelRegistration.scala
index a217099..af01a4b 100644
--- a/library/src/main/scala/za/co/absa/springdocopenapiscala/OpenAPIModelRegistration.scala
+++ b/library/src/main/scala/za/co/absa/springdocopenapiscala/OpenAPIModelRegistration.scala
@@ -95,6 +95,7 @@ class OpenAPIModelRegistration(
   private def handleCaseType(tpe: Type): Schema[_] = {
     val name = tpe.typeSymbol.name.toString.trim
     val schema = new Schema
+    schema.setType("object")
     val fields = tpe.decls.collect {
       case field: TermSymbol if field.isVal => field
     }
diff --git a/library/src/test/scala/za/co/absa/springdocopenapiscala/OpenAPIModelRegistrationSpec.scala b/library/src/test/scala/za/co/absa/springdocopenapiscala/OpenAPIModelRegistrationSpec.scala
index 2b8ded4..a816fd9 100644
--- a/library/src/test/scala/za/co/absa/springdocopenapiscala/OpenAPIModelRegistrationSpec.scala
+++ b/library/src/test/scala/za/co/absa/springdocopenapiscala/OpenAPIModelRegistrationSpec.scala
@@ -161,6 +161,7 @@ class OpenAPIModelRegistrationSpec extends AnyFlatSpec {
 
     val actualSchemas = components.getSchemas
 
+    assertTypeAndFormatAreAsExpected(actualSchemas, "OnlySimpleTypes", "object")
     assertTypeAndFormatAreAsExpected(actualSchemas, "OnlySimpleTypes.a", "string")
     assertTypeAndFormatAreAsExpected(actualSchemas, "OnlySimpleTypes.b", "integer", Some("int32"))
     assertTypeAndFormatAreAsExpected(actualSchemas, "OnlySimpleTypes.c", "integer", Some("int32"))
@@ -186,6 +187,7 @@ class OpenAPIModelRegistrationSpec extends AnyFlatSpec {
 
     val actualSchemas = components.getSchemas
 
+    assertTypeAndFormatAreAsExpected(actualSchemas, "SimpleTypesMaybeInOption", "object")
     assertTypeAndFormatAreAsExpected(actualSchemas, "SimpleTypesMaybeInOption.a", "string")
     assertTypeAndFormatAreAsExpected(actualSchemas, "SimpleTypesMaybeInOption.b", "string")
     assertTypeAndFormatAreAsExpected(actualSchemas, "SimpleTypesMaybeInOption.c", "integer", Some("int32"))
@@ -206,12 +208,15 @@ class OpenAPIModelRegistrationSpec extends AnyFlatSpec {
 
     val actualSchemas = components.getSchemas
 
+    assertTypeAndFormatAreAsExpected(actualSchemas, "ChildChildCaseClass", "object")
     assertTypeAndFormatAreAsExpected(actualSchemas, "ChildChildCaseClass.a", "string")
 
+    assertTypeAndFormatAreAsExpected(actualSchemas, "ChildCaseClass", "object")
     assertTypeAndFormatAreAsExpected(actualSchemas, "ChildCaseClass.a", "string")
     assertTypeAndFormatAreAsExpected(actualSchemas, "ChildCaseClass.b", "integer", Some("int32"))
     assertRefIsAsExpected(actualSchemas, "ChildCaseClass.child", "#/components/schemas/ChildChildCaseClass")
 
+    assertTypeAndFormatAreAsExpected(actualSchemas, "ParentCaseClass", "object")
     assertRefIsAsExpected(actualSchemas, "ParentCaseClass.child", "#/components/schemas/ChildCaseClass")
     assertTypeAndFormatAreAsExpected(actualSchemas, "ParentCaseClass.other", "string")
   }
@@ -313,6 +318,7 @@ class OpenAPIModelRegistrationSpec extends AnyFlatSpec {
 
     assertTypeAndFormatAreAsExpected(actualSchemas, "SealedAbstractClassVariant.a", "string")
     assert(actualSchemas.containsKey("SealedAbstractClassCaseObject"))
+    assertTypeAndFormatAreAsExpected(actualSchemas, "SealedAbstractClassCaseObject", "object")
     assert(Option(actualSchemas.get("SealedAbstractClassCaseObject").getProperties).isEmpty)
 
     assertPredicateForPath(