Index: uspace/lib/c/include/macros.h
===================================================================
--- uspace/lib/c/include/macros.h	(revision b4df8db46336b1d3a612064e87644b1698115b9c)
+++ uspace/lib/c/include/macros.h	(revision 623bab8f043f0e60c5e6d04af58ed83d9338327b)
@@ -38,5 +38,5 @@
 #define min(a, b)  ((a) < (b) ? (a) : (b))
 #define max(a, b)  ((a) > (b) ? (a) : (b))
-#define abs(a)     ((a) >= 0 ? (a) : (-a))
+#define abs(a)     ((a) >= 0 ? (a) : -(a))