diff --git a/lib/cfn.js b/lib/cfn.js
index 21e7e15..56fac19 100644
--- a/lib/cfn.js
+++ b/lib/cfn.js
@@ -5,10 +5,13 @@ const fs = require('fs');
 
 function hash2ArrayHash(hash, keyProperty = 'Key', valueProperty = 'Value') {
   return Object.keys(hash)
-    .map(key => ({
-      [keyProperty]: key,
-      [valueProperty]: hash[key]
-    }));
+    .map(key => {
+      return hash[key] !== undefined ? {
+        [keyProperty]: key,
+        [valueProperty]: hash[key]
+      } : undefined;
+    })
+    .filter(Boolean);
 }
 
 function ucFirst(str) {
@@ -116,6 +119,10 @@ class CfnClient {
         let value = options[origKey];
         let key = ucFirst(origKey);
 
+        if (value === undefined) {
+          return;
+        }
+
         switch (origKey) {
           case 'parameters':
             value = hash2ArrayHash(value, 'ParameterKey', 'ParameterValue');
diff --git a/tests/unit/cfn-test.js b/tests/unit/cfn-test.js
index 7133fd9..407198c 100644
--- a/tests/unit/cfn-test.js
+++ b/tests/unit/cfn-test.js
@@ -23,7 +23,8 @@ const options = {
   templateBody: `file://${templatePath}`,
   parameters: {
     key1: 'val1',
-    key2: 'val2'
+    key2: 'val2',
+    key3: undefined
   },
   capabilities: ['CAPABILITY_IAM'],
   resourceTypes: ['AWS::*'],
@@ -38,7 +39,8 @@ const options = {
   disableRollback: true,
   rollbackConfiguration: {
     MonitoringTimeInMinutes: 10
-  }
+  },
+  dummy: undefined
 };
 
 const templateBody = fs.readFileSync(templatePath, { encoding: 'utf8' });