diff --git a/pgpainless-core/src/main/java/org/pgpainless/key/selection/keyring/impl/Wildcard.java b/pgpainless-core/src/main/java/org/pgpainless/key/selection/keyring/impl/Wildcard.java
index 2528321a..8a373ffa 100644
--- a/pgpainless-core/src/main/java/org/pgpainless/key/selection/keyring/impl/Wildcard.java
+++ b/pgpainless-core/src/main/java/org/pgpainless/key/selection/keyring/impl/Wildcard.java
@@ -22,7 +22,7 @@ import org.pgpainless.key.selection.keyring.SecretKeyRingSelectionStrategy;
 
 public class Wildcard {
 
-    public class PubRingSelectionStrategy<O> extends PublicKeyRingSelectionStrategy<O> {
+    public static class PubRingSelectionStrategy<O> extends PublicKeyRingSelectionStrategy<O> {
 
         @Override
         public boolean accept(O identifier, PGPPublicKeyRing keyRing) {
@@ -30,7 +30,7 @@ public class Wildcard {
         }
     }
 
-    public class SecRingSelectionStrategy<O> extends SecretKeyRingSelectionStrategy<O> {
+    public static class SecRingSelectionStrategy<O> extends SecretKeyRingSelectionStrategy<O> {
 
         @Override
         public boolean accept(O identifier, PGPSecretKeyRing keyRing) {