diff --git a/src/Kaleidoscope-Hardware-Model01.h b/src/Kaleidoscope-Hardware-Model01.h
index 2e58fd23..e2fe552d 100644
--- a/src/Kaleidoscope-Hardware-Model01.h
+++ b/src/Kaleidoscope-Hardware-Model01.h
@@ -58,7 +58,7 @@ class Model01 {
   static uint32_t rightHandMask;
 };
 
-#define SCANBIT(row,col) ((uint32_t)1 << (row * 8 + (7 - col)))
+#define SCANBIT(row,col) ((uint32_t)1 << ((row) * 8 + (7 - (col))))
 
 #define R0C0  SCANBIT(0, 0)
 #define R0C1  SCANBIT(0, 1)