Index: uspace/lib/c/include/bitops.h
===================================================================
--- uspace/lib/c/include/bitops.h	(revision 7cf7ded59bfcb0ce3986ba191f580a7814749ae4)
+++ uspace/lib/c/include/bitops.h	(revision 6896409cd9474f55ef576a06416616a7b3889494)
@@ -40,9 +40,9 @@
 /** Mask with bit @a n set. */
 #define BIT_V(type, n) \
-    ((type)1 << ((n) - 1))
+    ((type)1 << (n))
 
 /** Mask with rightmost @a n bits set. */
 #define BIT_RRANGE(type, n) \
-    (BIT_V(type, (n) + 1) - 1)
+    (BIT_V(type, (n)) - 1)
 
 /** Mask with bits @a hi .. @a lo set. @a hi >= @a lo. */