diff --git a/OpenSim/Region/ScriptEngine/Shared/Api/Implementation/OSSL_Api.cs b/OpenSim/Region/ScriptEngine/Shared/Api/Implementation/OSSL_Api.cs
index c24903c8ac5..cd92adebfed 100644
--- a/OpenSim/Region/ScriptEngine/Shared/Api/Implementation/OSSL_Api.cs
+++ b/OpenSim/Region/ScriptEngine/Shared/Api/Implementation/OSSL_Api.cs
@@ -4021,7 +4021,7 @@ private void SetProjectionParams(SceneObjectPart obj, LSL_Integer llprojection,
                 obj.Shape.ProjectionEntry = true;
                 obj.Shape.ProjectionTextureUUID = texID;
                 obj.Shape.ProjectionFOV = Util.Clamp((float)fov, 0, 3.0f);
-                obj.Shape.ProjectionFocus = Util.Clamp((float)focus, 0, 20.0f);
+                obj.Shape.ProjectionFocus = Util.Clamp((float)focus, -20.0f, 20.0f);
                 obj.Shape.ProjectionAmbiance = Util.Clamp((float)amb, 0, 1.0f);
 
                 obj.ParentGroup.HasGroupChanged = true;