diff --git a/libjava/java/util/zip/ZipConstants.java b/libjava/java/util/zip/ZipConstants.java
index 4aec92e02c4..d5ca82d9c34 100644
--- a/libjava/java/util/zip/ZipConstants.java
+++ b/libjava/java/util/zip/ZipConstants.java
@@ -8,6 +8,11 @@ details.  */
 
 package java.util.zip;
 
-public interface ZipConstants
+interface ZipConstants
 {
+  // Size in bytes of local file header, including signature.
+  public static final int LOCAL_FILE_HEADER_SIZE = 30;
+
+  // Size in bytes of the "end of central directory" record, with signature.
+  public static final int END_CENTRAL_DIR_SIZE = 22;
 }