diff --git a/src/cmd/asm/internal/arch/loong64.go b/src/cmd/asm/internal/arch/loong64.go
index 1fef6baf42..d9e428d953 100644
--- a/src/cmd/asm/internal/arch/loong64.go
+++ b/src/cmd/asm/internal/arch/loong64.go
@@ -88,7 +88,7 @@ func Loong64RegisterExtension(a *obj.Addr, ext string, reg, num int16, isAmount,
 	case reg >= loong64.REG_X0 && reg <= loong64.REG_X31:
 		simd_type = loong64.LASX
 	default:
-		return errors.New("Loong64 extension: invalid LSX/LASX register: " + fmt.Sprintf("%p", reg))
+		return errors.New("Loong64 extension: invalid LSX/LASX register: " + fmt.Sprintf("%d", reg))
 	}
 
 	if isIndex {