diff --git a/src/cmd/gc/sysimport.c b/src/cmd/gc/sysimport.c
index da12b6361ab..4d682d675d0 100644
--- a/src/cmd/gc/sysimport.c
+++ b/src/cmd/gc/sysimport.c
@@ -65,5 +65,7 @@ char *sysimport =
 char *unsafeimport =
 	"package unsafe\n"
 	"type unsafe.Pointer *any\n"
+	"func unsafe.Offsetof (? any) (? int)\n"
+	"func unsafe.Sizeof (? any) (? int)\n"
 	"\n"
 	"$$\n";