diff --git a/sys/i386/svr4/svr4_genassym.c b/sys/i386/svr4/svr4_genassym.c
index 675f0e4ae22..deb375f813d 100644
--- a/sys/i386/svr4/svr4_genassym.c
+++ b/sys/i386/svr4/svr4_genassym.c
@@ -3,6 +3,7 @@
 
 #include <sys/param.h>
 #include <sys/assym.h>
+#include <sys/systm.h>
 
 #include <compat/svr4/svr4_signal.h>
 #include <compat/svr4/svr4_ucontext.h>