diff --git a/libs/main/core/pivariant.h b/libs/main/core/pivariant.h
index bea37f17..b3bf5183 100644
--- a/libs/main/core/pivariant.h
+++ b/libs/main/core/pivariant.h
@@ -751,7 +751,8 @@ REGISTER_VARIANT(PIPointd)
 REGISTER_VARIANT(PIRectd)
 REGISTER_VARIANT(PIMathVectord)
 REGISTER_VARIANT(PIMathMatrixd)
-
+typedef std::function<void(void*)> KeySlot;
+REGISTER_VARIANT(KeySlot)
 
 inline PIByteArray & operator <<(PIByteArray & s, const PIVariant & v) {
 	s << v._content << int(v._type);