diff --git a/MeshShaderHeightmapRGBA.glsl b/MeshShaderHeightmapRGBA.glsl
index fdd6ef1..cb6ea3c 100644
--- a/MeshShaderHeightmapRGBA.glsl
+++ b/MeshShaderHeightmapRGBA.glsl
@@ -78,6 +78,6 @@ void main()
 
 	uint triangleID = gl_LocalInvocationID.x*2;
 
-	gl_PrimitiveTriangleIndicesEXT[triangleID] = uvec3(vertexID, vertexID+1, vertexID+2);
-	gl_PrimitiveTriangleIndicesEXT[triangleID + 1] = uvec3(vertexID+2, vertexID+1, vertexID+3);
+	gl_PrimitiveTriangleIndicesEXT[triangleID] = uvec3(vertexID+2, vertexID+1, vertexID);
+	gl_PrimitiveTriangleIndicesEXT[triangleID + 1] = uvec3(vertexID+3, vertexID+1, vertexID+2);
 }