diff --git a/modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/DartClientCodegen.java b/modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/DartClientCodegen.java
index 55221e3a226..cb6e20705cb 100644
--- a/modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/DartClientCodegen.java
+++ b/modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/DartClientCodegen.java
@@ -313,6 +313,9 @@ public class DartClientCodegen extends DefaultCodegen implements CodegenConfig {
         }
 
         if (schema.getDefault() != null) {
+            if (ModelUtils.isStringSchema(schema)) {
+                return "\"" + schema.getDefault().toString().replaceAll("\"", "\\\"") + "\"";
+            }
             return schema.getDefault().toString();
         } else {
             return "null";