diff --git a/processor/src/main/java/org/mapstruct/ap/internal/util/JavaStreamConstants.java b/processor/src/main/java/org/mapstruct/ap/internal/util/JavaStreamConstants.java
index f23e89435a..acd63abcd7 100644
--- a/processor/src/main/java/org/mapstruct/ap/internal/util/JavaStreamConstants.java
+++ b/processor/src/main/java/org/mapstruct/ap/internal/util/JavaStreamConstants.java
@@ -13,10 +13,6 @@
 public final class JavaStreamConstants {
 
     public static final String STREAM_FQN = "java.util.stream.Stream";
-    public static final String COLLECTORS_FQN = "java.util.stream.Collectors";
-    public static final String STREAM_SUPPORT_FQN = "java.util.stream.StreamSupport";
-    public static final String OPTIONAL_FQN = "java.util.Optional";
-    public static final String FUNCTION_FQN = "java.util.function.Function";
 
     private JavaStreamConstants() {
     }