diff --git a/src/cmd/cgo/main.go b/src/cmd/cgo/main.go
index 0c1c863a7a0..b992f6fae19 100644
--- a/src/cmd/cgo/main.go
+++ b/src/cmd/cgo/main.go
@@ -165,6 +165,7 @@ var ptrSizeMap = map[string]int64{
 	"ppc64le":  8,
 	"s390":     4,
 	"s390x":    8,
+	"sparc64":  8,
 }
 
 var intSizeMap = map[string]int64{
@@ -180,6 +181,7 @@ var intSizeMap = map[string]int64{
 	"ppc64le":  8,
 	"s390":     4,
 	"s390x":    8,
+	"sparc64":  8,
 }
 
 var cPrefix string