diff --git a/arm9/source/config.c b/arm9/source/config.c
index d2bcb12..ad693d3 100644
--- a/arm9/source/config.c
+++ b/arm9/source/config.c
@@ -866,7 +866,7 @@ void configMenu(bool oldPinStatus, u32 oldPinMode)
     for(u32 i = 0; i < multiOptionsAmount; i++)
         configData.multiConfig |= multiOptions[i].enabled << (i * 2);
 
-    configData.config &= ~(1 << (u32)NUMCONFIGURABLE) - 1;
+    configData.config &= ~((1 << (u32)NUMCONFIGURABLE) - 1);
     for(u32 i = 0; i < singleOptionsAmount; i++)
         configData.config |= (singleOptions[i].enabled ? 1 : 0) << i;