diff --git a/src/ifcopenshell-python/ifcopenshell/express/rules/IFC2X3.py b/src/ifcopenshell-python/ifcopenshell/express/rules/IFC2X3.py
index d8869ec8ee..0c0d207db8 100644
--- a/src/ifcopenshell-python/ifcopenshell/express/rules/IFC2X3.py
+++ b/src/ifcopenshell-python/ifcopenshell/express/rules/IFC2X3.py
@@ -30,8 +30,9 @@ def usedin(inst, ref_name):
 
 
 class express_set(set):
-    def __rmul__(self, other):
+    def __mul__(self, other):
         return express_set(set(other) & self)
+    __rmul__ = __mul__
     def __add__(self, other):
         def make_list(v):
             # Comply with 12.6.3 Union operator
diff --git a/src/ifcopenshell-python/ifcopenshell/express/rules/IFC4.py b/src/ifcopenshell-python/ifcopenshell/express/rules/IFC4.py
index 98dbb94658..0a5cbdf988 100644
--- a/src/ifcopenshell-python/ifcopenshell/express/rules/IFC4.py
+++ b/src/ifcopenshell-python/ifcopenshell/express/rules/IFC4.py
@@ -30,8 +30,9 @@ def usedin(inst, ref_name):
 
 
 class express_set(set):
-    def __rmul__(self, other):
+    def __mul__(self, other):
         return express_set(set(other) & self)
+    __rmul__ = __mul__
     def __add__(self, other):
         def make_list(v):
             # Comply with 12.6.3 Union operator
diff --git a/src/ifcopenshell-python/ifcopenshell/express/rules/IFC4X1.py b/src/ifcopenshell-python/ifcopenshell/express/rules/IFC4X1.py
index d48221a2f3..a672ae0437 100644
--- a/src/ifcopenshell-python/ifcopenshell/express/rules/IFC4X1.py
+++ b/src/ifcopenshell-python/ifcopenshell/express/rules/IFC4X1.py
@@ -30,8 +30,9 @@ def usedin(inst, ref_name):
 
 
 class express_set(set):
-    def __rmul__(self, other):
+    def __mul__(self, other):
         return express_set(set(other) & self)
+    __rmul__ = __mul__
     def __add__(self, other):
         def make_list(v):
             # Comply with 12.6.3 Union operator
diff --git a/src/ifcopenshell-python/ifcopenshell/express/rules/IFC4X2.py b/src/ifcopenshell-python/ifcopenshell/express/rules/IFC4X2.py
index 7b77367e77..aedd15a4e4 100644
--- a/src/ifcopenshell-python/ifcopenshell/express/rules/IFC4X2.py
+++ b/src/ifcopenshell-python/ifcopenshell/express/rules/IFC4X2.py
@@ -30,8 +30,9 @@ def usedin(inst, ref_name):
 
 
 class express_set(set):
-    def __rmul__(self, other):
+    def __mul__(self, other):
         return express_set(set(other) & self)
+    __rmul__ = __mul__
     def __add__(self, other):
         def make_list(v):
             # Comply with 12.6.3 Union operator
diff --git a/src/ifcopenshell-python/ifcopenshell/express/rules/IFC4X3.py b/src/ifcopenshell-python/ifcopenshell/express/rules/IFC4X3.py
index dcf49af269..ab998e2e18 100644
--- a/src/ifcopenshell-python/ifcopenshell/express/rules/IFC4X3.py
+++ b/src/ifcopenshell-python/ifcopenshell/express/rules/IFC4X3.py
@@ -30,8 +30,9 @@ def usedin(inst, ref_name):
 
 
 class express_set(set):
-    def __rmul__(self, other):
+    def __mul__(self, other):
         return express_set(set(other) & self)
+    __rmul__ = __mul__
     def __add__(self, other):
         def make_list(v):
             # Comply with 12.6.3 Union operator
diff --git a/src/ifcopenshell-python/ifcopenshell/express/rules/IFC4X3_ADD1.py b/src/ifcopenshell-python/ifcopenshell/express/rules/IFC4X3_ADD1.py
index f627f37ff4..99e99daf2e 100644
--- a/src/ifcopenshell-python/ifcopenshell/express/rules/IFC4X3_ADD1.py
+++ b/src/ifcopenshell-python/ifcopenshell/express/rules/IFC4X3_ADD1.py
@@ -30,8 +30,9 @@ def usedin(inst, ref_name):
 
 
 class express_set(set):
-    def __rmul__(self, other):
+    def __mul__(self, other):
         return express_set(set(other) & self)
+    __rmul__ = __mul__
     def __add__(self, other):
         def make_list(v):
             # Comply with 12.6.3 Union operator
diff --git a/src/ifcopenshell-python/ifcopenshell/express/rules/IFC4X3_RC1.py b/src/ifcopenshell-python/ifcopenshell/express/rules/IFC4X3_RC1.py
index 79ac6b3d51..d2b5f14c50 100644
--- a/src/ifcopenshell-python/ifcopenshell/express/rules/IFC4X3_RC1.py
+++ b/src/ifcopenshell-python/ifcopenshell/express/rules/IFC4X3_RC1.py
@@ -30,8 +30,9 @@ def usedin(inst, ref_name):
 
 
 class express_set(set):
-    def __rmul__(self, other):
+    def __mul__(self, other):
         return express_set(set(other) & self)
+    __rmul__ = __mul__
     def __add__(self, other):
         def make_list(v):
             # Comply with 12.6.3 Union operator
diff --git a/src/ifcopenshell-python/ifcopenshell/express/rules/IFC4X3_RC2.py b/src/ifcopenshell-python/ifcopenshell/express/rules/IFC4X3_RC2.py
index b4a23d9af3..ac490428bf 100644
--- a/src/ifcopenshell-python/ifcopenshell/express/rules/IFC4X3_RC2.py
+++ b/src/ifcopenshell-python/ifcopenshell/express/rules/IFC4X3_RC2.py
@@ -30,8 +30,9 @@ def usedin(inst, ref_name):
 
 
 class express_set(set):
-    def __rmul__(self, other):
+    def __mul__(self, other):
         return express_set(set(other) & self)
+    __rmul__ = __mul__
     def __add__(self, other):
         def make_list(v):
             # Comply with 12.6.3 Union operator
diff --git a/src/ifcopenshell-python/ifcopenshell/express/rules/IFC4X3_RC3.py b/src/ifcopenshell-python/ifcopenshell/express/rules/IFC4X3_RC3.py
index b68a9c737c..1f85e02bce 100644
--- a/src/ifcopenshell-python/ifcopenshell/express/rules/IFC4X3_RC3.py
+++ b/src/ifcopenshell-python/ifcopenshell/express/rules/IFC4X3_RC3.py
@@ -30,8 +30,9 @@ def usedin(inst, ref_name):
 
 
 class express_set(set):
-    def __rmul__(self, other):
+    def __mul__(self, other):
         return express_set(set(other) & self)
+    __rmul__ = __mul__
     def __add__(self, other):
         def make_list(v):
             # Comply with 12.6.3 Union operator
diff --git a/src/ifcopenshell-python/ifcopenshell/express/rules/IFC4X3_RC4.py b/src/ifcopenshell-python/ifcopenshell/express/rules/IFC4X3_RC4.py
index 1782d84181..6e111ecf2d 100644
--- a/src/ifcopenshell-python/ifcopenshell/express/rules/IFC4X3_RC4.py
+++ b/src/ifcopenshell-python/ifcopenshell/express/rules/IFC4X3_RC4.py
@@ -30,8 +30,9 @@ def usedin(inst, ref_name):
 
 
 class express_set(set):
-    def __rmul__(self, other):
+    def __mul__(self, other):
         return express_set(set(other) & self)
+    __rmul__ = __mul__
     def __add__(self, other):
         def make_list(v):
             # Comply with 12.6.3 Union operator
diff --git a/src/ifcopenshell-python/ifcopenshell/express/rules/IFC4X3_TC1.py b/src/ifcopenshell-python/ifcopenshell/express/rules/IFC4X3_TC1.py
index fe5642a755..239d64fe39 100644
--- a/src/ifcopenshell-python/ifcopenshell/express/rules/IFC4X3_TC1.py
+++ b/src/ifcopenshell-python/ifcopenshell/express/rules/IFC4X3_TC1.py
@@ -30,8 +30,9 @@ def usedin(inst, ref_name):
 
 
 class express_set(set):
-    def __rmul__(self, other):
+    def __mul__(self, other):
         return express_set(set(other) & self)
+    __rmul__ = __mul__
     def __add__(self, other):
         def make_list(v):
             # Comply with 12.6.3 Union operator