diff --git a/src/cli/generate-markdown.test.ts b/src/cli/generate-markdown.test.ts
index 9f8f631..e1af245 100644
--- a/src/cli/generate-markdown.test.ts
+++ b/src/cli/generate-markdown.test.ts
@@ -40,6 +40,7 @@ describe('generateMarkdown', () => {
         schema: z
           .string()
           .default('0.0.0.0')
+          .transform((val) => val)
           .optional()
           .describe('Server host'),
       },
diff --git a/src/cli/generate-markdown.ts b/src/cli/generate-markdown.ts
index 275e53e..f02465e 100644
--- a/src/cli/generate-markdown.ts
+++ b/src/cli/generate-markdown.ts
@@ -33,8 +33,11 @@ export const generateMarkdown = (
     }
 
     for (const envvar of envvars) {
-      const schema = envvar.schema['~standard'].jsonSchema.output({
+      const schema = envvar.schema['~standard'].jsonSchema.input({
         target: 'openapi-3.0',
+        libraryOptions: {
+          unrepresentable: 'any',
+        },
       });
 
       const mappedType = Array.isArray(schema.anyOf)