diff --git a/modules/openapi-generator/src/main/java/org/openapitools/codegen/config/CodegenConfigurator.java b/modules/openapi-generator/src/main/java/org/openapitools/codegen/config/CodegenConfigurator.java
index 508242595a5..777e4888e7a 100644
--- a/modules/openapi-generator/src/main/java/org/openapitools/codegen/config/CodegenConfigurator.java
+++ b/modules/openapi-generator/src/main/java/org/openapitools/codegen/config/CodegenConfigurator.java
@@ -541,6 +541,8 @@ public class CodegenConfigurator implements Serializable {
         config.languageSpecificPrimitives().addAll(languageSpecificPrimitives);
         config.reservedWordsMappings().putAll(reservedWordMappings);
 
+        config.setStrictSpecBehavior(isStrictSpecBehavior());
+
         checkAndSetAdditionalProperty(apiPackage, CodegenConstants.API_PACKAGE);
         checkAndSetAdditionalProperty(modelPackage, CodegenConstants.MODEL_PACKAGE);
         checkAndSetAdditionalProperty(invokerPackage, CodegenConstants.INVOKER_PACKAGE);