--- a/src/hotspot/share/prims/nativeLookup.cpp	Mon Oct 21 09:26:14 2019 -0700
+++ b/src/hotspot/share/prims/nativeLookup.cpp	Mon Oct 21 13:13:16 2019 -0400
@@ -106,7 +106,7 @@
   st.print("__");
   // find ')'
   int end;
-  for (end = 0; end < signature->utf8_length() && signature->char_at(end) != ')'; end++);
+  for (end = 0; end < signature->utf8_length() && signature->char_at(end) != JVM_SIGNATURE_ENDFUNC; end++);
   // skip first '('
   mangle_name_on(&st, signature, 1, end);
   return st.as_string();