diff --git a/src/kernel/system/udl.h b/src/kernel/system/udl.h
index 85f275cf..ebbacabb 100644
--- a/src/kernel/system/udl.h
+++ b/src/kernel/system/udl.h
@@ -15,42 +15,42 @@
  *  Allows cross-platform literals with compile-time cast.
  */
 
-constexpr uint64_t operator"" _ui64(unsigned long long x)
+constexpr uint64_t operator""_ui64(unsigned long long x)
 {
     return static_cast<uint64_t>(x);
 }
 
-constexpr uint32_t operator"" _ui32(unsigned long long x)
+constexpr uint32_t operator""_ui32(unsigned long long x)
 {
     return static_cast<uint32_t>(x);
 }
 
-constexpr uint16_t operator"" _ui16(unsigned long long x)
+constexpr uint16_t operator""_ui16(unsigned long long x)
 {
     return static_cast<uint16_t>(x);
 }
 
-constexpr uint8_t operator"" _ui8(unsigned long long x)
+constexpr uint8_t operator""_ui8(unsigned long long x)
 {
     return static_cast<uint8_t>(x);
 }
 
-constexpr int64_t operator"" _i64(unsigned long long x)
+constexpr int64_t operator""_i64(unsigned long long x)
 {
     return static_cast<int64_t>(x);
 }
 
-constexpr int32_t operator"" _i32(unsigned long long x)
+constexpr int32_t operator""_i32(unsigned long long x)
 {
     return static_cast<int32_t>(x);
 }
 
-constexpr int16_t operator"" _i16(unsigned long long x)
+constexpr int16_t operator""_i16(unsigned long long x)
 {
     return static_cast<int16_t>(x);
 }
 
-constexpr int8_t operator"" _i8(unsigned long long x)
+constexpr int8_t operator""_i8(unsigned long long x)
 {
     return static_cast<int8_t>(x);
 }