diff --git a/src/util/prometheus/impl/CounterImpl.h b/src/util/prometheus/impl/CounterImpl.h
index c5982acaf..c3b58c2c5 100644
--- a/src/util/prometheus/impl/CounterImpl.h
+++ b/src/util/prometheus/impl/CounterImpl.h
@@ -30,7 +30,7 @@ namespace util::prometheus::detail {
 template <typename T>
 concept SomeCounterImpl = requires(T a) {
     typename std::remove_cvref_t<T>::ValueType;
-    SomeNumberType<typename std::remove_cvref_t<T>::ValueType>;
+    requires SomeNumberType<typename std::remove_cvref_t<T>::ValueType>;
     {
         a.add(typename std::remove_cvref_t<T>::ValueType{1})
     } -> std::same_as<void>;
diff --git a/src/util/prometheus/impl/HistogramImpl.h b/src/util/prometheus/impl/HistogramImpl.h
index c1d914730..1254423c2 100644
--- a/src/util/prometheus/impl/HistogramImpl.h
+++ b/src/util/prometheus/impl/HistogramImpl.h
@@ -30,7 +30,7 @@ namespace util::prometheus::detail {
 template <typename T>
 concept SomeHistogramImpl = requires(T t) {
     typename std::remove_cvref_t<T>::ValueType;
-    SomeNumberType<typename std::remove_cvref_t<T>::ValueType>;
+    requires SomeNumberType<typename std::remove_cvref_t<T>::ValueType>;
     {
         t.observe(typename std::remove_cvref_t<T>::ValueType{1})
     } -> std::same_as<void>;