diff --git a/lib/modules/mergeScripts.es6 b/lib/modules/mergeScripts.es6
index f3413e9..9eab5df 100644
--- a/lib/modules/mergeScripts.es6
+++ b/lib/modules/mergeScripts.es6
@@ -33,7 +33,12 @@ export default function mergeScripts(tree) {
         let lastScriptNode = scriptNodes.pop();
         scriptNodes.reverse().forEach(scriptNode => {
             let scriptContent = (scriptNode.content || []).join(' ');
-            lastScriptNode.content.unshift(scriptContent + ' ');
+            scriptContent = scriptContent.trim();
+            if (scriptContent.slice(-1) !== ';') {
+                scriptContent += ';';
+            }
+
+            lastScriptNode.content.unshift(scriptContent);
 
             scriptNode.tag = false;
             scriptNode.content = [];
@@ -41,4 +46,4 @@ export default function mergeScripts(tree) {
     }
 
     return tree;
-}
\ No newline at end of file
+}
diff --git a/test/modules/mergeScripts.js b/test/modules/mergeScripts.js
index 08783a2..7abeefe 100644
--- a/test/modules/mergeScripts.js
+++ b/test/modules/mergeScripts.js
@@ -15,11 +15,43 @@ describe('mergeScripts', () => {
             <script class="test" type="text/javascript">foo = 7;</script>`,
 
             '\n            \n            \n            \n            ' +
-            `<script>var foo = 1; foo = 3; foo = 5;</script>
-            <script defer="defer">foo = 4; foo = 6;</script>
-            <script class="test" type="text/javascript">foo = 2; foo = 7;</script>`,
+            `<script>var foo = 1;foo = 3;foo = 5;</script>
+            <script defer="defer">foo = 4;foo = 6;</script>
+            <script class="test" type="text/javascript">foo = 2;foo = 7;</script>`,
 
             options
         );
     });
-});
\ No newline at end of file
+
+    it('should add trailing ; when it\'s missing in oneline <script>', () => {
+        return init(
+            '<script>document.write("Hello, ")</script><script>document.write("World!")</script>',
+            '<script>document.write("Hello, ");document.write("World!")</script>',
+            options
+        );
+    });
+
+    it('should add trailing ; when it\'s missing in multiline <script>', () => {
+        return init(
+            `<script>
+
+                // Some comment
+                var a = 5;
+                var b = a + 6
+
+            </script><script>
+
+                var c = 10
+
+            </script>`,
+            `<script>// Some comment
+                var a = 5;
+                var b = a + 6;
+
+                var c = 10
+
+            </script>`,
+            options
+        );
+    });
+});