diff --git a/common/changes/@uifabric/example-app-base/disable-tree-shaking_2018-03-30-03-49.json b/common/changes/@uifabric/example-app-base/disable-tree-shaking_2018-03-30-03-49.json
new file mode 100644
index 0000000000000..a0e130f245507
--- /dev/null
+++ b/common/changes/@uifabric/example-app-base/disable-tree-shaking_2018-03-30-03-49.json
@@ -0,0 +1,11 @@
+{
+  "changes": [
+    {
+      "packageName": "@uifabric/example-app-base",
+      "comment": "We need to temporarily remove `sideEffects: false` flag from package.json which will disable w",
+      "type": "patch"
+    }
+  ],
+  "packageName": "@uifabric/example-app-base",
+  "email": "dzearing@microsoft.com"
+}
\ No newline at end of file
diff --git a/common/changes/@uifabric/experiments/disable-tree-shaking_2018-03-30-03-49.json b/common/changes/@uifabric/experiments/disable-tree-shaking_2018-03-30-03-49.json
new file mode 100644
index 0000000000000..e68896d74913c
--- /dev/null
+++ b/common/changes/@uifabric/experiments/disable-tree-shaking_2018-03-30-03-49.json
@@ -0,0 +1,11 @@
+{
+  "changes": [
+    {
+      "packageName": "@uifabric/experiments",
+      "comment": "We need to temporarily remove `sideEffects: false` flag from package.json which will disable w",
+      "type": "patch"
+    }
+  ],
+  "packageName": "@uifabric/experiments",
+  "email": "dzearing@microsoft.com"
+}
\ No newline at end of file
diff --git a/common/changes/office-ui-fabric-react/disable-tree-shaking_2018-03-30-03-49.json b/common/changes/office-ui-fabric-react/disable-tree-shaking_2018-03-30-03-49.json
new file mode 100644
index 0000000000000..04ab5668cc38c
--- /dev/null
+++ b/common/changes/office-ui-fabric-react/disable-tree-shaking_2018-03-30-03-49.json
@@ -0,0 +1,11 @@
+{
+  "changes": [
+    {
+      "packageName": "office-ui-fabric-react",
+      "comment": "We need to temporarily remove `sideEffects: false` flag from package.json which will disable webpack 4 tree shaking until we can identify a good fix for it to not shake out the scss files.",
+      "type": "patch"
+    }
+  ],
+  "packageName": "office-ui-fabric-react",
+  "email": "dzearing@microsoft.com"
+}
\ No newline at end of file
diff --git a/packages/example-app-base/package.json b/packages/example-app-base/package.json
index 7934eb518762c..bf386d06f56a3 100644
--- a/packages/example-app-base/package.json
+++ b/packages/example-app-base/package.json
@@ -5,7 +5,7 @@
   "main": "lib/index.js",
   "module": "lib-es2015/index.js",
   "typings": "lib-es2015/index.d.ts",
-  "sideEffects": false,
+  "sideEffects": true,
   "repository": {
     "type": "git",
     "url": "https://github.com/OfficeDev/office-ui-fabric-react"
diff --git a/packages/experiments/package.json b/packages/experiments/package.json
index 6c0175b3628cc..3bd6a09b50201 100644
--- a/packages/experiments/package.json
+++ b/packages/experiments/package.json
@@ -5,7 +5,7 @@
   "main": "lib/index.js",
   "module": "lib-es2015/index.js",
   "typings": "lib-es2015/index.d.ts",
-  "sideEffects": false,
+  "sideEffects": true,
   "repository": {
     "type": "git",
     "url": "https://github.com/OfficeDev/office-ui-fabric-react"
diff --git a/packages/office-ui-fabric-react/package.json b/packages/office-ui-fabric-react/package.json
index 9214af1100bb3..ca788fce98405 100644
--- a/packages/office-ui-fabric-react/package.json
+++ b/packages/office-ui-fabric-react/package.json
@@ -5,7 +5,7 @@
   "main": "lib/index.js",
   "module": "lib-es2015/index.js",
   "typings": "lib-es2015/index.d.ts",
-  "sideEffects": false,
+  "sideEffects": true,
   "repository": {
     "type": "git",
     "url": "https://github.com/OfficeDev/office-ui-fabric-react"