diff --git a/intern/cycles/kernel/osl/nodes/node_mapping.osl b/intern/cycles/kernel/osl/nodes/node_mapping.osl
index f342837d3c9..2e720edfc7e 100644
--- a/intern/cycles/kernel/osl/nodes/node_mapping.osl
+++ b/intern/cycles/kernel/osl/nodes/node_mapping.osl
@@ -20,9 +20,9 @@
 
 shader node_mapping(
 	matrix Matrix = matrix(0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0),
-	point Vector = point(0.0, 0.0, 0.0),
-	output point Vector_ = point(0.0, 0.0, 0.0))
+	point VectorIn = point(0.0, 0.0, 0.0),
+	output point VectorOut = point(0.0, 0.0, 0.0))
 {
-	Vector_ = transform(Matrix, Vector);
+	VectorOut = transform(Matrix, VectorIn);
 }