Index: uspace/lib/libc/generic/io/klog.c
===================================================================
--- uspace/lib/libc/generic/io/klog.c	(revision d8f92868d9c40327364b19689dce9dc910486f3e)
+++ uspace/lib/libc/generic/io/klog.c	(revision 5a4fef9166269adb2f4c2650c7bbc9f3b70f56ba)
@@ -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;
 }