diff --git a/modules/openapi-generator/src/main/resources/Java/libraries/okhttp-gson/api.mustache b/modules/openapi-generator/src/main/resources/Java/libraries/okhttp-gson/api.mustache
index 9519ce13c75e..f7f59302a431 100644
--- a/modules/openapi-generator/src/main/resources/Java/libraries/okhttp-gson/api.mustache
+++ b/modules/openapi-generator/src/main/resources/Java/libraries/okhttp-gson/api.mustache
@@ -263,7 +263,7 @@ public class {{classname}} {
             ExecutableValidator executableValidator = factory.getValidator().forExecutables();
 
             Object[] parameterValues = { {{#allParams}}{{paramName}}{{^-last}}, {{/-last}}{{/allParams}} };
-            Method method = this.getClass().getMethod("{{operationId}}WithHttpInfo"{{#allParams}}, {{#isArray}}java.util.List{{/isArray}}{{#isMap}}java.util.Map{{/isMap}}{{^isArray}}{{^isMap}}{{>nullable_var_annotations}} {{{dataType}}}{{/isMap}}{{/isArray}}.class{{/allParams}});
+            Method method = this.getClass().getMethod("{{operationId}}WithHttpInfo"{{#allParams}}, {{#isArray}}java.util.List{{/isArray}}{{#isMap}}java.util.Map{{/isMap}}{{^isArray}}{{^isMap}} {{{dataType}}}{{/isMap}}{{/isArray}}.class{{/allParams}});
             Set<ConstraintViolation<{{classname}}>> violations = executableValidator.validateParameters(this, method,
                     parameterValues);