diff --git a/include/seastar/core/units.hh b/include/seastar/core/units.hh
index 1848a88544..fd51bf06c3 100644
--- a/include/seastar/core/units.hh
+++ b/include/seastar/core/units.hh
@@ -34,10 +34,10 @@ constexpr size_t KB = 1 << 10;
 constexpr size_t MB = 1 << 20;
 constexpr size_t GB = 1 << 30;
 
-constexpr size_t operator"" _KiB(unsigned long long n) { return n << 10; }
-constexpr size_t operator"" _MiB(unsigned long long n) { return n << 20; }
-constexpr size_t operator"" _GiB(unsigned long long n) { return n << 30; }
-constexpr size_t operator"" _TiB(unsigned long long n) { return n << 40; }
+constexpr size_t operator""_KiB(unsigned long long n) { return n << 10; }
+constexpr size_t operator""_MiB(unsigned long long n) { return n << 20; }
+constexpr size_t operator""_GiB(unsigned long long n) { return n << 30; }
+constexpr size_t operator""_TiB(unsigned long long n) { return n << 40; }
 
 SEASTAR_MODULE_EXPORT_END
 }