diff --git a/api/src/main/java/jakarta/activation/MailcapCommandMap.java b/api/src/main/java/jakarta/activation/MailcapCommandMap.java
index 53ff3fc..f3a186d 100644
--- a/api/src/main/java/jakarta/activation/MailcapCommandMap.java
+++ b/api/src/main/java/jakarta/activation/MailcapCommandMap.java
@@ -697,13 +697,13 @@ private MailcapRegistryProvider getImplementation() {
             return AccessController.doPrivileged(new PrivilegedAction<MailcapRegistryProvider>() {
                 public MailcapRegistryProvider run() {
                     return FactoryFinder.find(MailcapRegistryProvider.class,
-                            "com.sun.activation.registries.MailcapRegistryProviderImpl",
+                            null,
                             false);
                 }
             });
         } else {
             return FactoryFinder.find(MailcapRegistryProvider.class,
-                    "com.sun.activation.registries.MailcapRegistryProviderImpl",
+                    null,
                     false);
         }
     }
diff --git a/api/src/main/java/jakarta/activation/MimetypesFileTypeMap.java b/api/src/main/java/jakarta/activation/MimetypesFileTypeMap.java
index cd642b2..716a865 100644
--- a/api/src/main/java/jakarta/activation/MimetypesFileTypeMap.java
+++ b/api/src/main/java/jakarta/activation/MimetypesFileTypeMap.java
@@ -389,13 +389,13 @@ private MimeTypeRegistryProvider getImplementation() {
             return AccessController.doPrivileged(new PrivilegedAction<MimeTypeRegistryProvider>() {
                 public MimeTypeRegistryProvider run() {
                     return FactoryFinder.find(MimeTypeRegistryProvider.class,
-                            "com.sun.activation.registries.MimeTypeRegistryProviderImpl",
+                            null,
                             false);
                 }
             });
         } else {
             return FactoryFinder.find(MimeTypeRegistryProvider.class,
-                    "com.sun.activation.registries.MimeTypeRegistryProviderImpl",
+                    null,
                     false);
         }
     }