Index: libc/signal/sigaction.c
===================================================================
--- libc/signal/sigaction.c	(revision 24734)
+++ libc/signal/sigaction.c	(working copy)
@@ -41,7 +41,7 @@
 	 * Try to catch this problem at uclibc build time:  */
 	struct BUG_sigset_size {
 		int BUG_sigset_size
-			[sizeof(act->sa_mask) != _NSIG / 8 ? 1 : -1];
+			[sizeof(act->sa_mask) == (_NSIG - 1) / 8 ? 1 : -1];
 	};
 	return __syscall_rt_sigaction(sig, act, oact, sizeof(act->sa_mask));
 }