diff --git a/src/pkg/big/Makefile b/src/pkg/big/Makefile
index d98f5b21bda..b64ba40bf56 100644
--- a/src/pkg/big/Makefile
+++ b/src/pkg/big/Makefile
@@ -9,8 +9,8 @@ GOFILES=\
 	defs.go\
 	arith.go\
 	big.go\
-	bigN.go\
-	bigZ.go\
+	nat.go\
+	int.go\
 
 OFILES=\
 	arith_$(GOARCH).$O\
diff --git a/src/pkg/big/bigZ.go b/src/pkg/big/int.go
similarity index 100%
rename from src/pkg/big/bigZ.go
rename to src/pkg/big/int.go
diff --git a/src/pkg/big/bigZ_test.go b/src/pkg/big/int_test.go
similarity index 100%
rename from src/pkg/big/bigZ_test.go
rename to src/pkg/big/int_test.go
diff --git a/src/pkg/big/bigN.go b/src/pkg/big/nat.go
similarity index 100%
rename from src/pkg/big/bigN.go
rename to src/pkg/big/nat.go
diff --git a/src/pkg/big/bigN_test.go b/src/pkg/big/nat_test.go
similarity index 100%
rename from src/pkg/big/bigN_test.go
rename to src/pkg/big/nat_test.go