--- a/langtools/src/jdk.compiler/share/classes/com/sun/tools/javac/jvm/ClassReader.java	Tue Jun 21 15:31:08 2016 +0100
+++ b/langtools/src/jdk.compiler/share/classes/com/sun/tools/javac/jvm/ClassReader.java	Tue Jun 21 21:06:54 2016 +0200
@@ -1039,7 +1039,8 @@
                             if (start_pc == 0) {
                                 // ensure array large enough
                                 if (register >= parameterNameIndices.length) {
-                                    int newSize = Math.max(register, parameterNameIndices.length + 8);
+                                    int newSize =
+                                            Math.max(register + 1, parameterNameIndices.length + 8);
                                     parameterNameIndices =
                                             Arrays.copyOf(parameterNameIndices, newSize);
                                 }