diff --git a/nx/include/switch/services/set.h b/nx/include/switch/services/set.h
index 7040e72d..d94284b6 100644
--- a/nx/include/switch/services/set.h
+++ b/nx/include/switch/services/set.h
@@ -825,9 +825,7 @@ typedef struct {
     u32 generation;
 } SetCalRsa2048DeviceKey;
 
-typedef struct {
-    char number[0x18];
-} SetCalSerialNumber;
+typedef SetSysSerialNumber SetCalSerialNumber;
 
 typedef struct {
     u8 parameter[0x5A];