diff --git a/demos/CUDA/BlackScholes/BlackScholes.cu b/demos/CUDA/BlackScholes/BlackScholes.cu
index 5e6df2cca..3c3617b44 100644
--- a/demos/CUDA/BlackScholes/BlackScholes.cu
+++ b/demos/CUDA/BlackScholes/BlackScholes.cu
@@ -83,7 +83,7 @@ const int OPT_SZ = OPT_N * sizeof(float);
 const float RISKFREE = 0.02f;
 const float VOLATILITY = 0.30f;
 
-#define DIV_UP(a, b) (((a) + (b)-1) / (b))
+#define DIV_UP(a, b) (((a) + (b) - 1) / (b))
 
 ////////////////////////////////////////////////////////////////////////////////
 // Main program