diff --git a/packages/imba/src/imba/runtime.mjs b/packages/imba/src/imba/runtime.mjs
index 3435137fd..f2c503438 100644
--- a/packages/imba/src/imba/runtime.mjs
+++ b/packages/imba/src/imba/runtime.mjs
@@ -179,6 +179,9 @@ export function augment$(klass,mixin){
 	Object.defineProperties(klass.prototype,descs);
 	// TODO Should also run a method / trigger a hook
 	try { meta.top.version++; } catch(e) { }
+
+	if(mixin?.mixed instanceof Function) mixin.mixed(klass)
+	
 	return klass;
 };
 
diff --git a/packages/imba/test/apps/mixins/isa.imba b/packages/imba/test/apps/mixins/isa.imba
index 4485f1d31..8bd5117d6 100644
--- a/packages/imba/test/apps/mixins/isa.imba
+++ b/packages/imba/test/apps/mixins/isa.imba
@@ -1,9 +1,11 @@
 import 'imba/spec'
 # test do
-let val = 0
+let val
 
 # Should this only be run once?
 class Base
+	static def mixed
+		val = 'mixed'
 
 class Action < Base
 
@@ -19,3 +21,4 @@ test do
 	ok (new Widget) !isa Action
 	ok (new Widget) isa Base
 	ok (new User) isa Base
+	ok val, 'mixed'