--- old/src/jdk.jlink/share/classes/jdk/tools/jlink/internal/ImageLocationWriter.java	2017-02-27 14:02:27.980038349 +0100
+++ new/src/jdk.jlink/share/classes/jdk/tools/jlink/internal/ImageLocationWriter.java	2017-02-27 14:02:27.736037139 +0100
@@ -108,24 +108,24 @@
         int hash = seed;
 
         if (getModuleOffset() != 0) {
-            hash = ImageStringsReader.hashCode("/", hash);
-            hash = ImageStringsReader.hashCode(getModule(), hash);
-            hash = ImageStringsReader.hashCode("/", hash);
+            hash = ImageStringsReader.unmaskedHashCode("/", hash);
+            hash = ImageStringsReader.unmaskedHashCode(getModule(), hash);
+            hash = ImageStringsReader.unmaskedHashCode("/", hash);
         }
 
         if (getParentOffset() != 0) {
-            hash = ImageStringsReader.hashCode(getParent(), hash);
-            hash = ImageStringsReader.hashCode("/", hash);
+            hash = ImageStringsReader.unmaskedHashCode(getParent(), hash);
+            hash = ImageStringsReader.unmaskedHashCode("/", hash);
         }
 
-        hash = ImageStringsReader.hashCode(getBase(), hash);
+        hash = ImageStringsReader.unmaskedHashCode(getBase(), hash);
 
         if (getExtensionOffset() != 0) {
-            hash = ImageStringsReader.hashCode(".", hash);
-            hash = ImageStringsReader.hashCode(getExtension(), hash);
+            hash = ImageStringsReader.unmaskedHashCode(".", hash);
+            hash = ImageStringsReader.unmaskedHashCode(getExtension(), hash);
         }
 
-        return hash;
+        return hash & ImageStringsReader.POSITIVE_MASK;
     }
 
     @Override