diff --git a/independent-projects/resteasy-reactive/server/processor/src/main/java/org/jboss/resteasy/reactive/server/processor/generation/exceptionmappers/ServerExceptionMapperGenerator.java b/independent-projects/resteasy-reactive/server/processor/src/main/java/org/jboss/resteasy/reactive/server/processor/generation/exceptionmappers/ServerExceptionMapperGenerator.java
index e40a932562258..60ddd874a0b23 100644
--- a/independent-projects/resteasy-reactive/server/processor/src/main/java/org/jboss/resteasy/reactive/server/processor/generation/exceptionmappers/ServerExceptionMapperGenerator.java
+++ b/independent-projects/resteasy-reactive/server/processor/src/main/java/org/jboss/resteasy/reactive/server/processor/generation/exceptionmappers/ServerExceptionMapperGenerator.java
@@ -273,7 +273,8 @@ public static Map<String, String> generateGlobalMapper(MethodInfo targetMethod,
                     // generate a constructor that takes the Instance<TargetClass> as an argument in order to avoid missing bean issues if the target has been conditionally disabled
                     // the body can freely read the instance value because if the target has been conditionally disabled, the generated class will not be instantiated
                     ctor = cc.getMethodCreator("<init>", void.class, Instance.class).setSignature(
-                            String.format("(Ljavax/enterprise/inject/Instance<L%s;>;)V",
+                            String.format("(L%s<L%s;>;)V",
+                                    Instance.class.getName().replace('.', '/'),
                                     targetClass.name().toString().replace('.', '/')));
                 } else {
                     // generate a constructor that takes the target class as an argument - this class is a CDI bean so Arc will be able to inject into the generated class
diff --git a/independent-projects/resteasy-reactive/server/processor/src/main/java/org/jboss/resteasy/reactive/server/processor/generation/filters/CustomFilterGenerator.java b/independent-projects/resteasy-reactive/server/processor/src/main/java/org/jboss/resteasy/reactive/server/processor/generation/filters/CustomFilterGenerator.java
index bb08d63067ee3..2c99a7eaac714 100644
--- a/independent-projects/resteasy-reactive/server/processor/src/main/java/org/jboss/resteasy/reactive/server/processor/generation/filters/CustomFilterGenerator.java
+++ b/independent-projects/resteasy-reactive/server/processor/src/main/java/org/jboss/resteasy/reactive/server/processor/generation/filters/CustomFilterGenerator.java
@@ -522,7 +522,9 @@ private FieldDescriptor generateConstructorAndDelegateField(ClassCreator cc, Cla
         if (checkForOptionalBean) {
             // generate a constructor that takes the Instance<TargetClass> as an argument
             ctor = cc.getMethodCreator("<init>", void.class, Instance.class).setSignature(
-                    String.format("(Ljavax/enterprise/inject/Instance<L%s;>;)V", declaringClassName.replace('.', '/')));
+                    String.format("(L%s<L%s;>;)V",
+                            Instance.class.getName().replace('.', '/'),
+                            declaringClassName.replace('.', '/')));
         } else {
             // generate a constructor that takes the target class as an argument - this class is a CDI bean so Arc will be able to inject into the generated class
             ctor = cc.getMethodCreator("<init>", void.class, declaringClassName);