diff --git a/test/core/imports.wast b/test/core/imports.wast
index 35e8c917f4..69f76a0bbe 100644
--- a/test/core/imports.wast
+++ b/test/core/imports.wast
@@ -30,11 +30,9 @@
   (type $func_f64 (func (param f64)))
 
   (import "spectest" "print_i32" (func (param i32)))
-  ;; JavaScript can't handle i64 yet.
-  ;; (func (import "spectest" "print_i64") (param i64))
+  (func (import "spectest" "print_i64") (param i64))
   (import "spectest" "print_i32" (func $print_i32 (param i32)))
-  ;; JavaScript can't handle i64 yet.
-  ;; (import "spectest" "print_i64" (func $print_i64 (param i64)))
+  (import "spectest" "print_i64" (func $print_i64 (param i64)))
   (import "spectest" "print_f32" (func $print_f32 (param f32)))
   (import "spectest" "print_f64" (func $print_f64 (param f64)))
   (import "spectest" "print_i32_f32" (func $print_i32_f32 (param i32 f32)))
@@ -72,14 +70,12 @@
   (func (export "print64") (param $i i64)
     (local $x f64)
     (local.set $x (f64.convert_i64_s (call $i64->i64 (local.get $i))))
-    ;; JavaScript can't handle i64 yet.
-    ;; (call 1 (local.get $i))
+    (call 1 (local.get $i))
     (call $print_f64_f64
       (f64.add (local.get $x) (f64.const 1))
       (f64.const 53)
     )
-    ;; JavaScript can't handle i64 yet.
-    ;; (call $print_i64 (local.get $i))
+    (call $print_i64 (local.get $i))
     (call $print_f64 (local.get $x))
     (call $print_f64-2 (local.get $x))
     (call_indirect (type $func_f64) (local.get $x) (i32.const 1))
@@ -234,8 +230,7 @@
   (import "spectest" "global_i32" (global $x i32))
   (global $y (import "spectest" "global_i32") i32)
 
-  ;; JavaScript can't handle i64 yet.
-  ;; (import "spectest" "global_i64" (global i64))
+  (import "spectest" "global_i64" (global i64))
   (import "spectest" "global_f32" (global f32))
   (import "spectest" "global_f64" (global f64))
 
diff --git a/test/harness/async_index.js b/test/harness/async_index.js
index 6d804bd56a..bb7d4cf5d0 100644
--- a/test/harness/async_index.js
+++ b/test/harness/async_index.js
@@ -93,11 +93,13 @@ function reinitializeRegistry() {
       eq_funcref: eq_funcref,
       print: console.log.bind(console),
       print_i32: console.log.bind(console),
+      print_i64: console.log.bind(console),
       print_i32_f32: console.log.bind(console),
       print_f64_f64: console.log.bind(console),
       print_f32: console.log.bind(console),
       print_f64: console.log.bind(console),
       global_i32: 666,
+      global_i64: 666n,
       global_f32: 666,
       global_f64: 666,
       table: new WebAssembly.Table({
diff --git a/test/harness/sync_index.js b/test/harness/sync_index.js
index 7ed9f29159..79469ee9be 100644
--- a/test/harness/sync_index.js
+++ b/test/harness/sync_index.js
@@ -103,11 +103,13 @@ function reinitializeRegistry() {
         eq_funcref: eq_funcref,
         print: console.log.bind(console),
         print_i32: console.log.bind(console),
+        print_i64: console.log.bind(console),
         print_i32_f32: console.log.bind(console),
         print_f64_f64: console.log.bind(console),
         print_f32: console.log.bind(console),
         print_f64: console.log.bind(console),
         global_i32: 666,
+        global_i64: 666n,
         global_f32: 666,
         global_f64: 666,
         table: new WebAssembly.Table({initial: 10, maximum: 20, element: 'anyfunc'}),