diff --git a/.prettierrc b/.prettierrc
new file mode 100644
index 0000000..5e783aa
--- /dev/null
+++ b/.prettierrc
@@ -0,0 +1,6 @@
+{
+  "semi": false,
+  "tabWidth": 2,
+  "singleQuote": true,
+  "printWidth": 100
+}
diff --git a/CHANGELOG.md b/CHANGELOG.md
index c67b701..54434fa 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,11 @@
 # Changelog
 
+## 0.8.3
+
+_2019-11-12_
+
+Added auto-px exception for `flex`. In IE `px` was being added even though numbers without units numbers should be accepted.
+
 ## 0.8.2
 
 _2019-11-08_
diff --git a/package-lock.json b/package-lock.json
index 7a8da45..aa3d8be 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,6 +1,6 @@
 {
   "name": "zaftig",
-  "version": "0.8.2",
+  "version": "0.8.3",
   "lockfileVersion": 1,
   "requires": true,
   "dependencies": {
@@ -887,9 +887,9 @@
       "dev": true
     },
     "source-map-support": {
-      "version": "0.5.13",
-      "resolved": "https://registry.npmjs.org/source-map-support/-/source-map-support-0.5.13.tgz",
-      "integrity": "sha512-SHSKFHadjVA5oR4PPqhtAVdcBWwRYVd6g6cAXnIbRiIwc2EhPrTuKUBdSLvlEKyIP3GCf89fltvcZiP9MMFA1w==",
+      "version": "0.5.16",
+      "resolved": "https://registry.npmjs.org/source-map-support/-/source-map-support-0.5.16.tgz",
+      "integrity": "sha512-efyLRJDr68D9hBBNIPWFjhpFzURh+KJykQwvMyW5UiZzYwoF6l4YMMDIJJEyFWxWCqfyxLzz6tSfUFR+kXXsVQ==",
       "dev": true,
       "requires": {
         "buffer-from": "^1.0.0",
@@ -941,9 +941,9 @@
       "dev": true
     },
     "terser": {
-      "version": "4.3.9",
-      "resolved": "https://registry.npmjs.org/terser/-/terser-4.3.9.tgz",
-      "integrity": "sha512-NFGMpHjlzmyOtPL+fDw3G7+6Ueh/sz4mkaUYa4lJCxOPTNzd0Uj0aZJOmsDYoSQyfuVoWDMSWTPU3huyOm2zdA==",
+      "version": "4.4.0",
+      "resolved": "https://registry.npmjs.org/terser/-/terser-4.4.0.tgz",
+      "integrity": "sha512-oDG16n2WKm27JO8h4y/w3iqBGAOSCtq7k8dRmrn4Wf9NouL0b2WpMHGChFGZq4nFAQy1FsNJrVQHfurXOSTmOA==",
       "dev": true,
       "requires": {
         "commander": "^2.20.0",
diff --git a/package.json b/package.json
index 848fc70..25ca93d 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "zaftig",
-  "version": "0.8.2",
+  "version": "0.8.3",
   "description": "css for your js",
   "source": "src/index.js",
   "main": "dist/zaftig.es5.min.js",
@@ -28,6 +28,6 @@
     "buble": "^0.19.8",
     "jsdom": "^15.2.1",
     "ospec": "^4.0.1",
-    "terser": "^4.3.9"
+    "terser": "^4.4.0"
   }
 }
diff --git a/src/index.js b/src/index.js
index 15fcc54..43317b7 100644
--- a/src/index.js
+++ b/src/index.js
@@ -78,6 +78,7 @@ const needsPx = memo(
       return testDiv.style.cssText.slice(-3) == 'px;'
     }),
   {
+    flex: false,
     border: true,
     'border-left': true,
     'border-right': true,