diff --git a/src/jit/jit-irgen.c b/src/jit/jit-irgen.c
index a4cb74d61..415673218 100644
--- a/src/jit/jit-irgen.c
+++ b/src/jit/jit-irgen.c
@@ -2369,6 +2369,8 @@ static void irgen_op_reflect_value(jit_irgen_t *g, int op)
       else
          j_send(g, 3, irgen_get_value(g, vreg));
    }
+   else
+      j_send(g, 3, value);
 
    macro_exit(g, JIT_EXIT_REFLECT_VALUE);
 
diff --git a/src/jit/jit-layout.c b/src/jit/jit-layout.c
index a2acc8495..ef8a5e976 100644
--- a/src/jit/jit-layout.c
+++ b/src/jit/jit-layout.c
@@ -74,7 +74,7 @@ const jit_layout_t *layout_of(type_t type)
          l->parts[0].align  = l->parts[0].size;
 
          l->parts[1].offset = sizeof(void *);
-         l->parts[1].size   = sizeof(int32_t);
+         l->parts[1].size   = sizeof(int64_t);
          l->parts[1].repeat = ndims * 2;
          l->parts[1].align  = l->parts[1].size;
       }
diff --git a/src/rt/reflect.c b/src/rt/reflect.c
index 51940543f..effe64ce7 100644
--- a/src/rt/reflect.c
+++ b/src/rt/reflect.c
@@ -278,25 +278,36 @@ static jit_scalar_t load_scalar(const void *base, size_t off, size_t size)
    return elt;
 }
 
-static jit_scalar_t *get_array_bounds(type_t type)
+static jit_scalar_t *get_array_bounds(type_t type, void *ptr)
 {
    const int ndims = dimension_of(type);
-
    jit_scalar_t *fbounds = xmalloc_array(ndims*2 + 1, sizeof(jit_scalar_t));
-   fbounds[0].pointer = NULL;
 
-   for (int i = 0; i < ndims; i++) {
-      tree_t r = range_of(type, i);
+   if (type_is_unconstrained(type)) {
+      ffi_uarray_t *u = ptr;
+      fbounds[0].pointer = u->ptr;
+
+      for (int i = 0; i < ndims; i++) {
+         fbounds[i*2+1].integer = u->dims[i].left;
+         fbounds[i*2+2].integer = u->dims[i].length;
+      }
+   }
+   else {
+      fbounds[0].pointer = ptr;
 
-      int64_t left, length;
-      if (!folded_int(tree_left(r), &left))
-         goto not_const;
-      else if (!folded_length(r, &length))
-         goto not_const;
+      for (int i = 0; i < ndims; i++) {
+         tree_t r = range_of(type, i);
 
-      const range_kind_t dir = tree_subkind(r);
-      fbounds[i*2+1].integer = left;
-      fbounds[i*2+2].integer = (dir == RANGE_DOWNTO ? ~length : length);
+         int64_t left, length;
+         if (!folded_int(tree_left(r), &left))
+            goto not_const;
+         else if (!folded_length(r, &length))
+            goto not_const;
+
+         const range_kind_t dir = tree_subkind(r);
+         fbounds[i*2+1].integer = left;
+         fbounds[i*2+2].integer = (dir == RANGE_DOWNTO ? ~length : length);
+      }
    }
 
    return fbounds;
@@ -421,8 +432,7 @@ static value_mirror *get_value_mirror(void *context, jit_scalar_t value,
             elements[i] = get_value_mirror(context, elt, ft, NULL);
          }
          else if (type_is_array(ft)) {
-            jit_scalar_t *fbounds LOCAL = get_array_bounds(ft);
-            fbounds[0].pointer = ptr;
+            jit_scalar_t *fbounds LOCAL = get_array_bounds(ft, ptr);
             elements[i] = get_value_mirror(context, fbounds[0], ft, fbounds);
          }
          else {
@@ -676,6 +686,9 @@ static subtype_mirror *get_subtype_mirror(void *context, type_t type,
       rsm->pt.f_fields->dims[0].length = nfields;
       rsm->pt.f_fields->ptr = rsm->pt.f_fields + 1;
 
+      const jit_layout_t *l = layout_of(type);
+      assert(l->nparts == nfields);
+
       field_rec *fields = rsm->pt.f_fields->ptr;
       for (int i = 0; i < nfields; i++) {
          tree_t f = type_field(base, i);
@@ -683,7 +696,8 @@ static subtype_mirror *get_subtype_mirror(void *context, type_t type,
 
          type_t ft = tree_type(f);
          if (type_is_array(ft)) {
-            jit_scalar_t *fbounds LOCAL = get_array_bounds(ft);
+            void *ptr = bounds[0].pointer + l->parts[i].offset;
+            jit_scalar_t *fbounds LOCAL = get_array_bounds(ft, ptr);
             fields[i].f_subtype = get_subtype_mirror(context, ft, fbounds);
          }
          else
@@ -708,7 +722,9 @@ void *x_reflect_value(void *context, jit_scalar_t value, tree_t where,
 
 void *x_reflect_subtype(void *context, tree_t where, const jit_scalar_t *bounds)
 {
-   return get_subtype_mirror(context, tree_type(where), bounds);
+   type_t type = tree_type(where);
+   assert(!type_is_unconstrained(type));   // Should be caught earlier
+   return get_subtype_mirror(context, type, bounds);
 }
 
 void _std_reflection_init(void)
diff --git a/src/sem.c b/src/sem.c
index 428bf6ff9..5caabff9d 100644
--- a/src/sem.c
+++ b/src/sem.c
@@ -3914,6 +3914,9 @@ static bool sem_check_attr_ref(tree_t t, bool allow_range, nametab_t *tab)
       if (get_type_or_null(name) == NULL)
          sem_error(t, "prefix of attribute REFLECT is not a type mark or "
                    "an object with a type");
+      else if (named_type != NULL && type_is_unconstrained(named_type))
+         sem_error(t, "prefix of 'REFLECT attribute must be a fully "
+                   "constrained subtype");
 
       return true;
 
diff --git a/test/regress/reflect4.vhd b/test/regress/reflect4.vhd
new file mode 100644
index 000000000..095afe556
--- /dev/null
+++ b/test/regress/reflect4.vhd
@@ -0,0 +1,45 @@
+entity reflect4 is
+end entity;
+
+use std.reflection.all;
+
+architecture test of reflect4 is
+    type rec1 is record
+        a, b : integer;
+        c : string;
+    end record;
+begin
+
+    p1: process is
+        variable v1   : rec1 := (1, 2, "abc");
+        variable vm   : value_mirror;
+        variable rvm  : record_value_mirror;
+        variable rstm : record_subtype_mirror;
+        variable astm : array_subtype_mirror;
+    begin
+        vm := v1'reflect;
+        rvm := vm.to_record;
+        rstm := rvm.get_subtype_mirror;
+        assert rstm.length = 3;
+        assert rstm.element_name(0) = "A";
+        assert rstm.element_name(1) = "B";
+        assert rstm.element_name(2) = "C";
+        assert rstm.element_index("B") = 1;
+        assert rstm.element_subtype("A") = integer'reflect;
+        assert rstm.element_subtype("C").get_type_class = class_array;
+
+        assert rvm.get(0).to_integer.value = 1;
+        assert rvm.get("b").to_integer.value = 2;
+
+        astm := rstm.element_subtype("C").to_array;
+        assert astm.length = 3;
+        assert astm.left = 1;
+        assert astm.right = 3;
+        assert astm.ascending;
+
+        assert rvm.get("c").to_array.get(1).to_enumeration.image = "'a'";
+        assert rvm.get("c").to_array.get(3).to_enumeration.image = "'c'";
+        wait;
+    end process;
+
+end architecture;
diff --git a/test/regress/testlist.txt b/test/regress/testlist.txt
index 248738628..596ec6c24 100644
--- a/test/regress/testlist.txt
+++ b/test/regress/testlist.txt
@@ -829,3 +829,4 @@ toplevel3       normal,guut.i=2,guut.s=2
 predef4         normal,2008
 protected11     fail,gold,2002
 issue744        normal,vhpi
+reflect4        normal,2019
diff --git a/test/sem/lcs2016_41.vhd b/test/sem/lcs2016_41.vhd
index 8684e1027..9e651484f 100644
--- a/test/sem/lcs2016_41.vhd
+++ b/test/sem/lcs2016_41.vhd
@@ -22,6 +22,7 @@ begin
         astm := stm.to_array;           -- OK
         vm := p1'reflect;               -- Error
         assert v'subtype'reflect.get_type_class = CLASS_ARRAY;  -- OK
+        stm := bit_vector'reflect;      -- Error
         wait;
     end process;
 
diff --git a/test/test_jit.c b/test/test_jit.c
index b3fc1c3a9..c619ad561 100644
--- a/test/test_jit.c
+++ b/test/test_jit.c
@@ -867,7 +867,7 @@ START_TEST(test_layout)
    ck_assert_int_eq(l->parts[0].repeat, 1);
    ck_assert_int_eq(l->parts[0].align, 8);
    ck_assert_int_eq(l->parts[1].offset, sizeof(void *));
-   ck_assert_int_eq(l->parts[1].size, 4);
+   ck_assert_int_eq(l->parts[1].size, sizeof(int64_t));
    ck_assert_int_eq(l->parts[1].repeat, 2);
 
    input_from_file(TESTDIR "/jit/layout.vhd");
diff --git a/test/test_sem.c b/test/test_sem.c
index b5a96f66d..994b02a54 100644
--- a/test/test_sem.c
+++ b/test/test_sem.c
@@ -3099,6 +3099,7 @@ START_TEST(test_lcs2016_41)
       { 19, "value VALUE_MIRROR does not match type of target INTEGER" },
       { 23, "prefix of attribute REFLECT is not a type mark or an object "
         "with a type" },
+      { 25, "prefix of 'REFLECT attribute must be a fully constrained " },
       { -1, NULL }
    };
    expect_errors(expect);