diff --git a/tests/tests/regression_tests.rs b/tests/tests/regression_tests.rs
index 0327906a5..0826bf046 100644
--- a/tests/tests/regression_tests.rs
+++ b/tests/tests/regression_tests.rs
@@ -710,6 +710,7 @@ swf_tests! {
     (as3_getouterscope, "avm2/getouterscope", 1),
     (as3_hasownproperty_namespaces, "avm2/hasownproperty_namespaces", 1),
     (as3_propertyisenumerable_namespaces, "avm2/propertyisenumerable_namespaces", 1),
+    (as3_interface_namespaces, "avm2/interface_namespaces", 1),
 }
 
 // TODO: These tests have some inaccuracies currently, so we use approx_eq to test that numeric values are close enough.
diff --git a/tests/tests/swfs/avm2/interface_namespaces/Test.as b/tests/tests/swfs/avm2/interface_namespaces/Test.as
new file mode 100644
index 000000000..dbfb528a0
--- /dev/null
+++ b/tests/tests/swfs/avm2/interface_namespaces/Test.as
@@ -0,0 +1,152 @@
+package {
+	public class Test {
+	}
+}
+
+namespace ruffle = "https://ruffle.rs/AS3/test_ns";
+
+interface ITest2 {
+	function method();
+	function method2();
+}
+
+class Test2 implements ITest2 {
+	function Test2() {
+	}
+	
+	public function method() {
+		trace("Instance method");
+	}
+	
+	public function method2() {
+		trace("Instance method 2");
+	}
+	
+	ruffle function method() {
+		trace("Ruffle-NS instance method");
+	}
+}
+
+interface ITest3 extends ITest2 {
+	function method3()
+}
+
+class Test3 extends Test2 implements ITest3 {
+	function Test3() {
+	}
+	
+	public override function method() {
+		trace("Child instance method pre-super");
+		super.method();
+		trace("Child instance method post-super");
+	}
+	
+	public function method3() {
+		trace("Child instance method3 pre-super");
+		super.method();
+		trace("Child instance method3 post-super");
+	}
+}
+
+class Test4 extends Test3 {
+	function Test4() {
+	}
+	
+	public override function method2() {
+		trace("Grandchild instance method2 pre-super");
+		super.method2();
+		trace("Grandchild instance method2 post-super");
+	}
+	
+	public override function method3() {
+		trace("Grandchild instance method3 pre-super");
+		super.method3();
+		trace("Grandchild instance method3 post-super");
+	}
+}
+
+interface IConflictTest2 {
+	function method();
+}
+
+class ConflictTest implements ITest2, IConflictTest2 {
+	public function method() {
+		trace("Conflicting instance method");
+	}
+	
+	public function method2() {
+		trace("Nonconflicting instance method 2");
+	}
+}
+
+trace("///var x = new Test3();");
+var x = new Test3();
+trace("///var x_as_iface2: ITest2 = x;");
+var x_as_iface2: ITest2 = x;
+trace("///var x_as_iface3: ITest3 = x;");
+var x_as_iface3: ITest3 = x;
+
+trace("///x_as_iface2.method();");
+trace(x_as_iface2.method());
+
+trace("///x_as_iface2.method2();");
+trace(x_as_iface2.method2());
+
+trace("///x_as_iface2.ruffle::method();");
+trace(x_as_iface2.ruffle::method());
+
+trace("///x_as_iface3.method();");
+trace(x_as_iface3.method());
+
+trace("///x_as_iface3.method2();");
+trace(x_as_iface3.method2());
+
+trace("///x_as_iface3.ruffle::method();");
+trace(x_as_iface3.ruffle::method());
+
+trace("///x_as_iface3.method3();");
+trace(x_as_iface3.method3());
+
+trace("///var y = new Test4();");
+var y = new Test4();
+trace("///var y_as_iface2: ITest2 = y;");
+var y_as_iface2: ITest2 = y;
+trace("///var y_as_iface3: ITest3 = y;");
+var y_as_iface3: ITest3 = y;
+
+trace("///y_as_iface2.method();");
+trace(y_as_iface2.method());
+
+trace("///y_as_iface2.method2();");
+trace(y_as_iface2.method2());
+
+trace("///y_as_iface2.ruffle::method();");
+trace(y_as_iface2.ruffle::method());
+
+trace("///y_as_iface3.method();");
+trace(y_as_iface3.method());
+
+trace("///y_as_iface3.method2();");
+trace(y_as_iface3.method2());
+
+trace("///y_as_iface3.method3();");
+trace(y_as_iface3.method3());
+
+trace("///y_as_iface3.ruffle::method();");
+trace(y_as_iface3.ruffle::method());
+
+trace("///var z = new ConflictTest();");
+var z = new ConflictTest();
+trace("///var z_as_iface2: ITest2 = z;");
+var z_as_iface2: ITest2 = z;
+trace("///var z_as_conflict: IConflictTest2 = z;");
+var z_as_conflict: IConflictTest2 = z;
+
+trace("///z_as_iface2.method();");
+trace(z_as_iface2.method());
+
+trace("///z_as_iface2.method2();");
+trace(z_as_iface2.method2());
+
+trace("///z_as_conflict.method();");
+trace(z_as_conflict.method());
\ No newline at end of file
diff --git a/tests/tests/swfs/avm2/interface_namespaces/output.txt b/tests/tests/swfs/avm2/interface_namespaces/output.txt
new file mode 100644
index 000000000..ba0a6380d
--- /dev/null
+++ b/tests/tests/swfs/avm2/interface_namespaces/output.txt
@@ -0,0 +1,78 @@
+///var x = new Test3();
+///var x_as_iface2: ITest2 = x;
+///var x_as_iface3: ITest3 = x;
+///x_as_iface2.method();
+Child instance method pre-super
+Instance method
+Child instance method post-super
+undefined
+///x_as_iface2.method2();
+Instance method 2
+undefined
+///x_as_iface2.ruffle::method();
+Ruffle-NS instance method
+undefined
+///x_as_iface3.method();
+Child instance method pre-super
+Instance method
+Child instance method post-super
+undefined
+///x_as_iface3.method2();
+Instance method 2
+undefined
+///x_as_iface3.ruffle::method();
+Ruffle-NS instance method
+undefined
+///x_as_iface3.method3();
+Child instance method3 pre-super
+Instance method
+Child instance method3 post-super
+undefined
+///var y = new Test4();
+///var y_as_iface2: ITest2 = y;
+///var y_as_iface3: ITest3 = y;
+///y_as_iface2.method();
+Child instance method pre-super
+Instance method
+Child instance method post-super
+undefined
+///y_as_iface2.method2();
+Grandchild instance method2 pre-super
+Instance method 2
+Grandchild instance method2 post-super
+undefined
+///y_as_iface2.ruffle::method();
+Ruffle-NS instance method
+undefined
+///y_as_iface3.method();
+Child instance method pre-super
+Instance method
+Child instance method post-super
+undefined
+///y_as_iface3.method2();
+Grandchild instance method2 pre-super
+Instance method 2
+Grandchild instance method2 post-super
+undefined
+///y_as_iface3.method3();
+Grandchild instance method3 pre-super
+Child instance method3 pre-super
+Instance method
+Child instance method3 post-super
+Grandchild instance method3 post-super
+undefined
+///y_as_iface3.ruffle::method();
+Ruffle-NS instance method
+undefined
+///var z = new ConflictTest();
+///var z_as_iface2: ITest2 = z;
+///var z_as_conflict: IConflictTest2 = z;
+///z_as_iface2.method();
+Conflicting instance method
+undefined
+///z_as_iface2.method2();
+Nonconflicting instance method 2
+undefined
+///z_as_conflict.method();
+Conflicting instance method
+undefined
diff --git a/tests/tests/swfs/avm2/interface_namespaces/test.fla b/tests/tests/swfs/avm2/interface_namespaces/test.fla
new file mode 100644
index 000000000..b93b0f420
Binary files /dev/null and b/tests/tests/swfs/avm2/interface_namespaces/test.fla differ
diff --git a/tests/tests/swfs/avm2/interface_namespaces/test.swf b/tests/tests/swfs/avm2/interface_namespaces/test.swf
new file mode 100644
index 000000000..3cbf79c5f
Binary files /dev/null and b/tests/tests/swfs/avm2/interface_namespaces/test.swf differ