diff --git a/kernel/include/sortix/limits.h b/kernel/include/sortix/limits.h
index 37cfd9e5..429923d3 100644
--- a/kernel/include/sortix/limits.h
+++ b/kernel/include/sortix/limits.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2014 Jonas 'Sortie' Termansen.
+ * Copyright (c) 2014, 2016 Jonas 'Sortie' Termansen.
  *
  * Permission to use, copy, modify, and distribute this software for any
  * purpose with or without fee is hereby granted, provided that the above
@@ -22,14 +22,8 @@
 
 #include <sys/cdefs.h>
 
-#ifdef __cplusplus
-extern "C" {
-#endif
-
+#if __USE_SORTIX || __USE_POSIX
 #define HOST_NAME_MAX 255
-
-#ifdef __cplusplus
-} /* extern "C" */
 #endif
 
 #endif
diff --git a/libc/include/limits.h b/libc/include/limits.h
new file mode 100644
index 00000000..6936c6a6
--- /dev/null
+++ b/libc/include/limits.h
@@ -0,0 +1,30 @@
+/*
+ * Copyright (c) 2014, 2016 Jonas 'Sortie' Termansen.
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ *
+ * limits.h
+ * Implementation constants.
+ */
+
+#ifndef INCLUDE_LIMITS_H
+#define INCLUDE_LIMITS_H
+
+#include <sys/cdefs.h>
+
+/* The compiler provides a bulk of the declarations. */
+#include_next <limits.h>
+
+#include <sortix/limits.h>
+
+#endif