diff --git a/sys/sys/libkern.h b/sys/sys/libkern.h
index 1e106a97cd0f..c9a3bf34b5dd 100644
--- a/sys/sys/libkern.h
+++ b/sys/sys/libkern.h
@@ -39,7 +39,9 @@
 
 #include <sys/cdefs.h>
 #include <sys/types.h>
+#ifdef _KERNEL
 #include <sys/systm.h>
+#endif
 
 /* BCD conversions. */
 extern u_char const	bcd2bin_data[];