Index: uspace/lib/libc/generic/io/klog.c
===================================================================
--- uspace/lib/libc/generic/io/klog.c	(revision 2595dab26d88ea3c1a3c7dd12ab61c9b1c7fd57a)
+++ uspace/lib/libc/generic/io/klog.c	(revision ccce242372aca2c29042948b947afb9cb1fc3631)
@@ -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;
 }