--- old/src/hotspot/share/services/heapDumper.cpp	2018-10-01 15:59:05.630834550 -0400
+++ new/src/hotspot/share/services/heapDumper.cpp	2018-10-01 15:59:05.160969453 -0400
@@ -696,7 +696,7 @@
 
 // returns hprof tag for the given type signature
 hprofTag DumperSupport::sig2tag(Symbol* sig) {
-  switch (sig->byte_at(0)) {
+  switch (sig->char_at(0)) {
     case JVM_SIGNATURE_CLASS    : return HPROF_NORMAL_OBJECT;
     case JVM_SIGNATURE_ARRAY    : return HPROF_NORMAL_OBJECT;
     case JVM_SIGNATURE_BYTE     : return HPROF_BYTE;
@@ -821,7 +821,7 @@
   for (FieldStream fld(ik, false, false); !fld.eos(); fld.next()) {
     if (!fld.access_flags().is_static()) {
       Symbol* sig = fld.signature();
-      switch (sig->byte_at(0)) {
+      switch (sig->char_at(0)) {
         case JVM_SIGNATURE_CLASS   :
         case JVM_SIGNATURE_ARRAY   : size += oopSize; break;