diff --git a/lib/make/typed.js b/lib/make/typed.js
index 478f4bd..7865e83 100644
--- a/lib/make/typed.js
+++ b/lib/make/typed.js
@@ -43,7 +43,8 @@ make.typed = {
    */
   float: function (limit = null) {
     let base = (limit !== null) ? random.number(limit) : random.number()
-    return 'new Float32Array([' + (base + random.float()) + '])[0]'
+    let value = random.chance(10) ? -(base + random.float()) : (base + random.float())
+    return 'new Float32Array([' + value + '])[0]'
   },
   unrestrictedFloat: function (limit = null) {
     if (random.chance(100)) {
@@ -55,14 +56,16 @@ make.typed = {
   },
   double: function (limit = null) {
     let base = (limit !== null) ? random.number(limit) : random.number()
-    return 'new Float64Array([' + (base + random.float()) + '])[0]'
+    let value = random.chance(10) ? -(base + random.float()) : (base + random.float())
+    return 'new Float64Array([' + value + '])[0]'
   },
   unrestrictedDouble: function (limit = null) {
     if (random.chance(100)) {
       return random.pick([NaN, +Infinity, -Infinity])
     } else {
       let base = (limit !== null) ? random.number(limit) : random.number()
-      return 'new Float64Array([' + (base + random.float()) + '])[0]'
+      let value = random.chance(10) ? -(base + random.float()) : (base + random.float())
+      return 'new Float64Array([' + value + '])[0]'
     }
   },
   any: function () {