diff --git a/src/internal/OpenApiTools/toTypeNode.ts b/src/internal/OpenApiTools/toTypeNode.ts
index 9a023781..e6334b1d 100644
--- a/src/internal/OpenApiTools/toTypeNode.ts
+++ b/src/internal/OpenApiTools/toTypeNode.ts
@@ -124,13 +124,13 @@ export const convert: Convert = (
   }
 
   if (Guard.isOneOfSchema(schema)) {
-    return generateMultiTypeNode(entryPoint, currentPoint, factory, schema.oneOf, context, convert, converterContext, "oneOf");
+    return nullable(factory, generateMultiTypeNode(entryPoint, currentPoint, factory, schema.oneOf, context, convert, converterContext, "oneOf"), !!schema.nullable);
   }
   if (Guard.isAllOfSchema(schema)) {
-    return generateMultiTypeNode(entryPoint, currentPoint, factory, schema.allOf, context, convert, converterContext, "allOf");
+    return nullable(factory, generateMultiTypeNode(entryPoint, currentPoint, factory, schema.allOf, context, convert, converterContext, "allOf"), !!schema.nullable);
   }
   if (Guard.isAnyOfSchema(schema)) {
-    return generateMultiTypeNode(entryPoint, currentPoint, factory, schema.anyOf, context, convert, converterContext, "anyOf");
+    return nullable(factory, generateMultiTypeNode(entryPoint, currentPoint, factory, schema.anyOf, context, convert, converterContext, "anyOf"), !!schema.nullable);
   }
 
   if (Guard.isHasNoMembersObject(schema)) {