diff --git a/rhino/src/main/java/org/mozilla/javascript/LazilyLoadedCtor.java b/rhino/src/main/java/org/mozilla/javascript/LazilyLoadedCtor.java
index b069bcfafc..602e953b32 100644
--- a/rhino/src/main/java/org/mozilla/javascript/LazilyLoadedCtor.java
+++ b/rhino/src/main/java/org/mozilla/javascript/LazilyLoadedCtor.java
@@ -35,7 +35,7 @@ public LazilyLoadedCtor(
         this(scope, propertyName, className, sealed, false);
     }
 
-    LazilyLoadedCtor(
+    public LazilyLoadedCtor(
             ScriptableObject scope,
             String propertyName,
             String className,
diff --git a/rhino/src/main/java/org/mozilla/javascript/RegExpProxy.java b/rhino/src/main/java/org/mozilla/javascript/RegExpProxy.java
index 092a93f136..c9abe50779 100644
--- a/rhino/src/main/java/org/mozilla/javascript/RegExpProxy.java
+++ b/rhino/src/main/java/org/mozilla/javascript/RegExpProxy.java
@@ -18,6 +18,8 @@ public interface RegExpProxy {
     public static final int RA_REPLACE_ALL = 3;
     public static final int RA_SEARCH = 4;
 
+    public void register(ScriptableObject scope, boolean sealed);
+
     public boolean isRegExp(Scriptable obj);
 
     public Object compileRegExp(Context cx, String source, String flags);
diff --git a/rhino/src/main/java/org/mozilla/javascript/ScriptRuntime.java b/rhino/src/main/java/org/mozilla/javascript/ScriptRuntime.java
index ccf5d091cd..4f7c2fb09c 100644
--- a/rhino/src/main/java/org/mozilla/javascript/ScriptRuntime.java
+++ b/rhino/src/main/java/org/mozilla/javascript/ScriptRuntime.java
@@ -19,7 +19,6 @@
 import java.util.ResourceBundle;
 import java.util.function.BiConsumer;
 import org.mozilla.javascript.ast.FunctionNode;
-import org.mozilla.javascript.regexp.NativeRegExpStringIterator;
 import org.mozilla.javascript.v8dtoa.DoubleConversion;
 import org.mozilla.javascript.v8dtoa.FastDtoa;
 import org.mozilla.javascript.xml.XMLLib;
@@ -189,7 +188,7 @@ public static ScriptableObject initSafeStandardObjects(
 
         NativeArrayIterator.init(scope, sealed);
         NativeStringIterator.init(scope, sealed);
-        NativeRegExpStringIterator.init(scope, sealed);
+        getRegExpProxy(cx).register(scope, sealed);
 
         NativeJavaObject.init(scope, sealed);
         NativeJavaMap.init(scope, sealed);
@@ -198,8 +197,6 @@ public static ScriptableObject initSafeStandardObjects(
                 cx.hasFeature(Context.FEATURE_E4X) && cx.getE4xImplementationFactory() != null;
 
         // define lazy-loaded properties using their class name
-        new LazilyLoadedCtor(
-                scope, "RegExp", "org.mozilla.javascript.regexp.NativeRegExp", sealed, true);
         new LazilyLoadedCtor(
                 scope, "Continuation", "org.mozilla.javascript.NativeContinuation", sealed, true);
 
diff --git a/rhino/src/main/java/org/mozilla/javascript/regexp/RegExpImpl.java b/rhino/src/main/java/org/mozilla/javascript/regexp/RegExpImpl.java
index f0910fd9ff..ef6ab3560f 100644
--- a/rhino/src/main/java/org/mozilla/javascript/regexp/RegExpImpl.java
+++ b/rhino/src/main/java/org/mozilla/javascript/regexp/RegExpImpl.java
@@ -9,6 +9,7 @@
 import org.mozilla.javascript.Context;
 import org.mozilla.javascript.Function;
 import org.mozilla.javascript.Kit;
+import org.mozilla.javascript.LazilyLoadedCtor;
 import org.mozilla.javascript.RegExpProxy;
 import org.mozilla.javascript.ScriptRuntime;
 import org.mozilla.javascript.Scriptable;
@@ -18,6 +19,13 @@
 /** */
 public class RegExpImpl implements RegExpProxy {
 
+    @Override
+    public void register(ScriptableObject scope, boolean sealed) {
+        NativeRegExpStringIterator.init(scope, sealed);
+        new LazilyLoadedCtor(
+                scope, "RegExp", "org.mozilla.javascript.regexp.NativeRegExp", sealed, true);
+    }
+
     @Override
     public boolean isRegExp(Scriptable obj) {
         return obj instanceof NativeRegExp;