diff --git a/tests/TestCommD3Q19.cpp b/tests/TestCommD3Q19.cpp
index 9934cd8d..6030cf82 100644
--- a/tests/TestCommD3Q19.cpp
+++ b/tests/TestCommD3Q19.cpp
@@ -310,7 +310,7 @@ int main(int argc, char **argv)
 			for (j=0;j<Ny;j++){
 				for (i=0;i<Nx;i++){
 					n = k*Nx*Ny+j*Nx+i;
-					id[n] = 1;
+					//id[n] = 1;
 					Dm.id[n] = id[n];
 				}
 			}