diff --git a/include/tsl/robin_growth_policy.h b/include/tsl/robin_growth_policy.h
index 2dc9c40..5d82f60 100644
--- a/include/tsl/robin_growth_policy.h
+++ b/include/tsl/robin_growth_policy.h
@@ -81,8 +81,7 @@
 
 #define TSL_RH_UNUSED(x) static_cast<void>(x)
 
-namespace tsl {
-namespace rh {
+namespace tsl::rh {
 
 /**
  * Grow the hash table by a factor of GrowthFactor keeping the bucket count to a
@@ -409,7 +408,6 @@ class prime_growth_policy {
                 "The type of m_iprime is not big enough.");
 };
 
-}  // namespace rh
-}  // namespace tsl
+}  // namespace tsl::rh
 
 #endif
diff --git a/include/tsl/robin_hash.h b/include/tsl/robin_hash.h
index 163e0e2..acf9930 100644
--- a/include/tsl/robin_hash.h
+++ b/include/tsl/robin_hash.h
@@ -42,9 +42,7 @@
 
 #include "robin_growth_policy.h"
 
-namespace tsl {
-
-namespace detail_robin_hash {
+namespace tsl::detail_robin_hash {
 
 template <typename T>
 struct make_void {
@@ -1582,8 +1580,6 @@ class robin_hash : private Hash, private KeyEqual, private GrowthPolicy {
   bool m_try_shrink_on_next_insert;
 };
 
-}  // namespace detail_robin_hash
-
-}  // namespace tsl
+}  // namespace tsl::detail_robin_hash
 
 #endif