diff --git a/src/graphics/opengl/VertexBufferGL.cpp b/src/graphics/opengl/VertexBufferGL.cpp
index 3b0b0f2817..a96476f237 100644
--- a/src/graphics/opengl/VertexBufferGL.cpp
+++ b/src/graphics/opengl/VertexBufferGL.cpp
@@ -20,7 +20,7 @@ namespace Graphics {
 			case ATTRIB_NORMAL: return 1;
 			case ATTRIB_DIFFUSE: return 2;
 			case ATTRIB_UV0: return 3;
-			case ATTRIB_TANGENT: return 4;
+			case ATTRIB_TANGENT: return 5;
 			default:
 				assert(false);
 				return 0;