diff --git a/api/src/main/java/com/instancify/scriptify/api/script/Script.java b/api/src/main/java/com/instancify/scriptify/api/script/Script.java
index fb38b95..60036ed 100644
--- a/api/src/main/java/com/instancify/scriptify/api/script/Script.java
+++ b/api/src/main/java/com/instancify/scriptify/api/script/Script.java
@@ -13,6 +13,14 @@
  */
 public interface Script<T> {
 
+    /**
+     * Retrieves the security manager associated with this script.
+     *
+     * @return The ScriptSecurityManager for this script
+     * @see ScriptSecurityManager
+     */
+    ScriptSecurityManager getSecurityManager();
+
     /**
      * Retrieves the function manager associated with this script.
      *
@@ -46,12 +54,11 @@ public interface Script<T> {
     void setConstantManager(ScriptConstantManager constantManager);
 
     /**
-     * Retrieves the security manager associated with this script.
+     * Add an extra script on top of the whole script.
      *
-     * @return The ScriptSecurityManager for this script
-     * @see ScriptSecurityManager
+     * @param script Extra script
      */
-    ScriptSecurityManager getSecurityManager();
+    void addExtraScript(String script);
 
     /**
      * Evaluates and executes this script.
diff --git a/build.gradle.kts b/build.gradle.kts
index 2fd6d2e..c559b2e 100644
--- a/build.gradle.kts
+++ b/build.gradle.kts
@@ -12,7 +12,7 @@ java {
 
 allprojects {
     group = "com.instancify.scriptify"
-    version = "1.4.3-SNAPSHOT"
+    version = "1.4.4-SNAPSHOT"
 }
 
 subprojects {
diff --git a/script-js-graalvm/src/main/java/com/instancify/scriptify/js/graalvm/script/JsScript.java b/script-js-graalvm/src/main/java/com/instancify/scriptify/js/graalvm/script/JsScript.java
index ab9968d..8858346 100644
--- a/script-js-graalvm/src/main/java/com/instancify/scriptify/js/graalvm/script/JsScript.java
+++ b/script-js-graalvm/src/main/java/com/instancify/scriptify/js/graalvm/script/JsScript.java
@@ -15,11 +15,20 @@
 import org.graalvm.polyglot.HostAccess;
 import org.graalvm.polyglot.Value;
 
+import java.util.ArrayList;
+import java.util.List;
+
 public class JsScript implements Script<Value> {
 
     private final ScriptSecurityManager securityManager = new StandardSecurityManager();
     private ScriptFunctionManager functionManager = new StandardFunctionManager();
     private ScriptConstantManager constantManager = new StandardConstantManager();
+    private final List<String> extraScript = new ArrayList<>();
+
+    @Override
+    public ScriptConstantManager getConstantManager() {
+        return constantManager;
+    }
 
     @Override
     public ScriptSecurityManager getSecurityManager() {
@@ -37,13 +46,13 @@ public void setFunctionManager(ScriptFunctionManager functionManager) {
     }
 
     @Override
-    public ScriptConstantManager getConstantManager() {
-        return constantManager;
+    public void setConstantManager(ScriptConstantManager constantManager) {
+        this.constantManager = constantManager;
     }
 
     @Override
-    public void setConstantManager(ScriptConstantManager constantManager) {
-        this.constantManager = constantManager;
+    public void addExtraScript(String script) {
+        this.extraScript.add(script);
     }
 
     @Override
@@ -84,8 +93,15 @@ public Value eval(String script) throws ScriptException {
             }
         }
 
+        // Building full script including extra script code
+        StringBuilder fullScript = new StringBuilder();
+        for (String extra : extraScript) {
+            fullScript.append(extra).append("\n");
+        }
+        fullScript.append(script);
+
         try {
-            return context.eval("js", script);
+            return context.eval("js", fullScript.toString());
         } catch (Exception e) {
             throw new ScriptException(e);
         } finally {
diff --git a/script-js-rhino/src/main/java/com/instancify/scriptify/js/rhino/script/JsScript.java b/script-js-rhino/src/main/java/com/instancify/scriptify/js/rhino/script/JsScript.java
index be474f7..27d5475 100644
--- a/script-js-rhino/src/main/java/com/instancify/scriptify/js/rhino/script/JsScript.java
+++ b/script-js-rhino/src/main/java/com/instancify/scriptify/js/rhino/script/JsScript.java
@@ -13,12 +13,16 @@
 import org.mozilla.javascript.Context;
 import org.mozilla.javascript.ScriptableObject;
 
+import java.util.ArrayList;
+import java.util.List;
+
 public class JsScript implements Script<Object> {
 
     private final Context context = Context.enter();
     private final ScriptSecurityManager securityManager = new StandardSecurityManager();
     private ScriptFunctionManager functionManager = new StandardFunctionManager();
     private ScriptConstantManager constantManager = new StandardConstantManager();
+    private final List<String> extraScript = new ArrayList<>();
 
     public JsScript() {
         context.setWrapFactory(new JsWrapFactory());
@@ -49,6 +53,11 @@ public void setConstantManager(ScriptConstantManager constantManager) {
         this.constantManager = constantManager;
     }
 
+    @Override
+    public void addExtraScript(String script) {
+        this.extraScript.add(script);
+    }
+
     @Override
     public Object eval(String script) throws ScriptException {
         ScriptableObject scope = context.initStandardObjects();
@@ -71,8 +80,15 @@ public Object eval(String script) throws ScriptException {
             }
         }
 
+        // Building full script including extra script code
+        StringBuilder fullScript = new StringBuilder();
+        for (String extra : extraScript) {
+            fullScript.append(extra).append("\n");
+        }
+        fullScript.append(script);
+
         try {
-            return context.evaluateString(scope, script, null, 1, null);
+            return context.evaluateString(scope, fullScript.toString(), null, 1, null);
         } catch (Exception e) {
             throw new ScriptException(e);
         } finally {