diff --git a/pyg_lib/csrc/ops/cuda/sampled_kernel.cu b/pyg_lib/csrc/ops/cuda/sampled_kernel.cu
index a73951f3..ae916dc3 100644
--- a/pyg_lib/csrc/ops/cuda/sampled_kernel.cu
+++ b/pyg_lib/csrc/ops/cuda/sampled_kernel.cu
@@ -10,7 +10,7 @@ namespace ops {
 namespace {
 
 #define THREADS 1024
-#define CDIV(N, M) ((N) + (M)-1) / (M)
+#define CDIV(N, M) ((N) + (M) - 1) / (M)
 
 enum FnType { ADD, SUB, MUL, DIV };
 const std::map<std::string, FnType> to_fn_type = {