diff --git a/hotspot/src/share/vm/compiler/compilerDirectives.hpp b/hotspot/src/share/vm/compiler/compilerDirectives.hpp
index 7c4efa650a5..a56a1037789 100644
--- a/hotspot/src/share/vm/compiler/compilerDirectives.hpp
+++ b/hotspot/src/share/vm/compiler/compilerDirectives.hpp
@@ -64,7 +64,7 @@ NOT_PRODUCT(cflags(TraceOptoPipelining, bool, TraceOptoPipelining, TraceOptoPipe
 NOT_PRODUCT(cflags(TraceOptoOutput,     bool, TraceOptoOutput, TraceOptoOutput)) \
     cflags(TraceSpilling,           bool, TraceSpilling, TraceSpilling) \
     cflags(Vectorize,               bool, false, Vectorize) \
-    cflags(VectorizeDebug,         uintx, 0, VectorizeDebug) \
+    cflags(VectorizeDebug,          uintx, 0, VectorizeDebug) \
     cflags(CloneMapDebug,           bool, false, CloneMapDebug) \
     cflags(IGVPrintLevel,           intx, PrintIdealGraphLevel, IGVPrintLevel) \
     cflags(MaxNodeLimit,            intx, MaxNodeLimit, MaxNodeLimit)
diff --git a/hotspot/src/share/vm/compiler/directivesParser.cpp b/hotspot/src/share/vm/compiler/directivesParser.cpp
index 2d09a56119d..c24f71b25f4 100644
--- a/hotspot/src/share/vm/compiler/directivesParser.cpp
+++ b/hotspot/src/share/vm/compiler/directivesParser.cpp
@@ -283,17 +283,18 @@ bool DirectivesParser::set_option_flag(JSON_TYPE t, JSON_VAL* v, const key* opti
       break;
 
     case JSON_NUMBER_INT:
-      if (option_key->flag_type != intxFlag) {
-        if (option_key->flag_type == doubleFlag) {
-          double dval = (double)v->int_value;
-          (set->*test)((void *)&dval);
-          break;
-        }
-        error(VALUE_ERROR, "Cannot use int value for an %s flag", flag_type_names[option_key->flag_type]);
-        return false;
-      } else {
+      if (option_key->flag_type == intxFlag) {
         intx ival = v->int_value;
         (set->*test)((void *)&ival);
+      } else if (option_key->flag_type == uintxFlag) {
+        uintx ival = v->uint_value;
+        (set->*test)((void *)&ival);
+      } else if (option_key->flag_type == doubleFlag) {
+        double dval = (double)v->int_value;
+        (set->*test)((void *)&dval);
+      } else {
+        error(VALUE_ERROR, "Cannot use int value for an %s flag", flag_type_names[option_key->flag_type]);
+        return false;
       }
       break;
 
@@ -627,6 +628,8 @@ void DirectivesParser::test() {
     "    match: \"foo/bar.*\"," "\n"
     "    c2: {" "\n"
     "      PrintInlining: false," "\n"
+    "      VectorizeDebug: 1," "\n"
+    "      VectorizeDebug: -1," "\n"
     "    }" "\n"
     "  }" "\n"
     "]" "\n", true);
diff --git a/hotspot/src/share/vm/utilities/json.hpp b/hotspot/src/share/vm/utilities/json.hpp
index 7106990ce34..1af63094bd7 100644
--- a/hotspot/src/share/vm/utilities/json.hpp
+++ b/hotspot/src/share/vm/utilities/json.hpp
@@ -52,6 +52,7 @@ class JSON : public ResourceObj {
 
   typedef union {
     int64_t int_value;
+    uint64_t uint_value;
     double double_value;
 
     struct {