diff --git a/OpenSim/Region/ScriptEngine/Shared/Api/Implementation/LSL_Api.cs b/OpenSim/Region/ScriptEngine/Shared/Api/Implementation/LSL_Api.cs
index 6f683052ec..59db81eeae 100644
--- a/OpenSim/Region/ScriptEngine/Shared/Api/Implementation/LSL_Api.cs
+++ b/OpenSim/Region/ScriptEngine/Shared/Api/Implementation/LSL_Api.cs
@@ -5900,7 +5900,7 @@ namespace OpenSim.Region.ScriptEngine.Shared.Api
 
                 for (int i = 0; i < rules.Length; i += 2)
                 {
-                    switch (Convert.ToInt32(rules.Data[i]))
+                    switch (rules.GetLSLIntegerItem(i))
                     {
                         case (int)ScriptBaseClass.PSYS_PART_FLAGS:
                             prules.PartDataFlags = (Primitive.ParticleSystem.ParticleDataFlags)(uint)rules.GetLSLIntegerItem(i + 1);
@@ -9871,4 +9871,4 @@ namespace OpenSim.Region.ScriptEngine.Shared.Api
             }
         }
     }
-}
\ No newline at end of file
+}