diff --git a/src/bonsai/bonsai/tool/ifc.py b/src/bonsai/bonsai/tool/ifc.py
index 57c81b84cf..de3b6dd735 100644
--- a/src/bonsai/bonsai/tool/ifc.py
+++ b/src/bonsai/bonsai/tool/ifc.py
@@ -77,12 +77,16 @@ class Ifc(bonsai.core.tool.Ifc):
         if not obj.BIMObjectProperties.location_checksum:
             return True  # Let's be conservative
         loc_check = np.frombuffer(eval(obj.BIMObjectProperties.location_checksum))
-        rot_check = np.frombuffer(eval(obj.BIMObjectProperties.rotation_checksum))
         loc_real = np.array(obj.matrix_world.translation).flatten()
-        rot_real = np.array(obj.matrix_world.to_3x3()).flatten()
-        if np.allclose(loc_check, loc_real, atol=1e-4) and np.allclose(rot_check, rot_real, atol=1e-2):
-            return False
-        return True
+        if not np.allclose(loc_check, loc_real, atol=1e-4): # 0.1 mm
+            return True
+        rot_check = np.frombuffer(eval(obj.BIMObjectProperties.rotation_checksum)).reshape(3, 3)
+        rot_real = np.array(obj.matrix_world.to_3x3())
+        rot_dot = np.dot(rot_check, rot_real.T)
+        angle_rad = np.arccos(np.clip((np.trace(rot_dot) - 1) / 2, -1, 1))
+        if angle_rad > 0.0017453292519943296: # 0.1 degrees
+            return True
+        return False
 
     @classmethod
     def schema(cls) -> ifcopenshell_wrapper.schema_definition: