Index: uspace/lib/libc/generic/io/klog.c
===================================================================
--- uspace/lib/libc/generic/io/klog.c	(revision e6b73ad0e334e9915cdf643e5b227e339c264cab)
+++ uspace/lib/libc/generic/io/klog.c	(revision 3da11f37e6b8b0d64576fbe67ae8bf361a41793d)
@@ -42,5 +42,10 @@
 size_t klog_write(const void *buf, size_t size)
 {
-	return (size_t) __SYSCALL3(SYS_KLOG, 1, (sysarg_t) buf, size);
+	ssize_t ret = (ssize_t) __SYSCALL3(SYS_KLOG, 1, (sysarg_t) buf, size);
+	
+	if (ret >= 0)
+		return (size_t) ret;
+	
+	return 0;
 }