diff --git a/benchmark/string.cpp b/benchmark/string.cpp
index 8352e1c9..a48c9a66 100644
--- a/benchmark/string.cpp
+++ b/benchmark/string.cpp
@@ -3,6 +3,7 @@
 // https://www.boost.org/LICENSE_1_0.txt
 
 #define _SILENCE_CXX17_OLD_ALLOCATOR_MEMBERS_DEPRECATION_WARNING
+#define _SILENCE_CXX20_CISO646_REMOVED_WARNING
 
 #include <boost/unordered_map.hpp>
 #include <boost/unordered/unordered_flat_map.hpp>
diff --git a/benchmark/string_view.cpp b/benchmark/string_view.cpp
index 68a629ae..065437bb 100644
--- a/benchmark/string_view.cpp
+++ b/benchmark/string_view.cpp
@@ -3,6 +3,7 @@
 // https://www.boost.org/LICENSE_1_0.txt
 
 #define _SILENCE_CXX17_OLD_ALLOCATOR_MEMBERS_DEPRECATION_WARNING
+#define _SILENCE_CXX20_CISO646_REMOVED_WARNING
 
 #include <boost/unordered_map.hpp>
 #include <boost/unordered/unordered_flat_map.hpp>
diff --git a/benchmark/uint32.cpp b/benchmark/uint32.cpp
index 127fb9f3..5b37de52 100644
--- a/benchmark/uint32.cpp
+++ b/benchmark/uint32.cpp
@@ -3,6 +3,7 @@
 // https://www.boost.org/LICENSE_1_0.txt
 
 #define _SILENCE_CXX17_OLD_ALLOCATOR_MEMBERS_DEPRECATION_WARNING
+#define _SILENCE_CXX20_CISO646_REMOVED_WARNING
 
 #include <boost/unordered_map.hpp>
 #include <boost/unordered/unordered_flat_map.hpp>
diff --git a/benchmark/uint64.cpp b/benchmark/uint64.cpp
index 963a6e77..44ef9fd4 100644
--- a/benchmark/uint64.cpp
+++ b/benchmark/uint64.cpp
@@ -3,6 +3,7 @@
 // https://www.boost.org/LICENSE_1_0.txt
 
 #define _SILENCE_CXX17_OLD_ALLOCATOR_MEMBERS_DEPRECATION_WARNING
+#define _SILENCE_CXX20_CISO646_REMOVED_WARNING
 
 #include <boost/unordered_map.hpp>
 #include <boost/unordered/unordered_flat_map.hpp>
diff --git a/benchmark/uuid.cpp b/benchmark/uuid.cpp
index d7036b58..3363bee0 100644
--- a/benchmark/uuid.cpp
+++ b/benchmark/uuid.cpp
@@ -3,6 +3,7 @@
 // https://www.boost.org/LICENSE_1_0.txt
 
 #define _SILENCE_CXX17_OLD_ALLOCATOR_MEMBERS_DEPRECATION_WARNING
+#define _SILENCE_CXX20_CISO646_REMOVED_WARNING
 
 #include <boost/unordered_map.hpp>
 #include <boost/unordered/unordered_flat_map.hpp>
diff --git a/benchmark/word_size.cpp b/benchmark/word_size.cpp
index a02371e5..d518b70c 100644
--- a/benchmark/word_size.cpp
+++ b/benchmark/word_size.cpp
@@ -3,6 +3,7 @@
 // https://www.boost.org/LICENSE_1_0.txt
 
 #define _SILENCE_CXX17_OLD_ALLOCATOR_MEMBERS_DEPRECATION_WARNING
+#define _SILENCE_CXX20_CISO646_REMOVED_WARNING
 
 #include <boost/unordered_map.hpp>
 #include <boost/unordered/unordered_flat_map.hpp>