diff --git a/README.md b/README.md
index 97d90cd..f07da86 100644
--- a/README.md
+++ b/README.md
@@ -26,7 +26,7 @@ functions:
       - subscriptionFilter:
           stage: prod
           logGroupName: /cloud-trail
-          filterPattern: "{ $.errorMessage != '' }"
+          filterPattern: '{ $.errorMessage != "" }'
 ```
 
 Supports also multiple subscription filter.
@@ -39,11 +39,11 @@ functions:
       - subscriptionFilter:
           stage: prod
           logGroupName: /cloud-trail
-          filterPattern: "{ $.errorMessage != '' }"
+          filterPattern: '{ $.errorMessage != "" }'
       - subscriptionFilter:
           stage: prod
           logGroupName: /my-log-group
-          filterPattern: "{ $.errorMessage != '' }"
+          filterPattern: '{ $.errorMessage != "" }'
   goodbye:
     handler: handler.goodbye
     events:
@@ -59,7 +59,7 @@ functions:
 |:---:|:---:|
 |stage|The deployment stage with serverless. Because only one subscription filter can be set for one LogGroup.|
 |logGroupName|The log group to associate with the subscription filter. |
-|filterPattern|The filtering expressions that restrict what gets delivered to the destination AWS resource. Sorry, if you want to use "{ $.xxx = yyy }" syntax, then surround ""(double quote).|
+|filterPattern|The filtering expressions that restrict what gets delivered to the destination AWS resource. Sorry, if you want to use '{ $.xxx = "yyy" }' syntax, then surround the whole in ''(single quote).|
 
 ## Future supports
 
diff --git a/src/index.js b/src/index.js
index b11d42a..c1a8e75 100644
--- a/src/index.js
+++ b/src/index.js
@@ -107,7 +107,7 @@ class ServerlessPluginSubscriptionFilter {
     return new Promise((resolve, _reject) => {
       const lambdaLogicalId = this.provider.naming.getLambdaLogicalId(functionName);
       const lambdaPermissionLogicalId = this.getLambdaPermissionLogicalId(functionName, setting.logGroupName);
-      const filterPattern = setting.filterPattern;
+      const filterPattern = this.escapeDoubleQuote(setting.filterPattern);
       const logGroupName = setting.logGroupName;
       const subscriptionFilterTemplate = `
         {
@@ -194,6 +194,10 @@ class ServerlessPluginSubscriptionFilter {
 
     return `${normalizedFunctionName}LambdaPermission${normalizedLogGroupName}`;
   }
+
+  escapeDoubleQuote(str) {
+    return str.replace(/\"/g, '\\"');
+  }
 }
 
 module.exports = ServerlessPluginSubscriptionFilter;