diff --git a/untests/flat_map_tests.cpp b/untests/flat_map_tests.cpp
index 7ad0dc8..487daa0 100644
--- a/untests/flat_map_tests.cpp
+++ b/untests/flat_map_tests.cpp
@@ -218,13 +218,13 @@ TEST_CASE("flat_map") {
 
             REQUIRE(s0.empty());
             REQUIRE_FALSE(s0.size());
-            REQUIRE(s0.max_size() == std::allocator<std::pair<int,unsigned>>().max_size());
+            REQUIRE(s0.max_size() == std::vector<std::pair<int,unsigned>>().max_size());
 
             s0.insert({2,42});
 
             REQUIRE_FALSE(s0.empty());
             REQUIRE(s0.size() == 1u);
-            REQUIRE(s0.max_size() == std::allocator<std::pair<int,unsigned>>().max_size());
+            REQUIRE(s0.max_size() == std::vector<std::pair<int,unsigned>>().max_size());
 
             s0.insert({2,84});
             REQUIRE(s0.size() == 1u);
@@ -236,7 +236,7 @@ TEST_CASE("flat_map") {
 
             REQUIRE(s0.empty());
             REQUIRE_FALSE(s0.size());
-            REQUIRE(s0.max_size() == std::allocator<std::pair<int,unsigned>>().max_size());
+            REQUIRE(s0.max_size() == std::vector<std::pair<int,unsigned>>().max_size());
         }
 
         {
diff --git a/untests/flat_multimap_tests.cpp b/untests/flat_multimap_tests.cpp
index 461a22b..9a3f90d 100644
--- a/untests/flat_multimap_tests.cpp
+++ b/untests/flat_multimap_tests.cpp
@@ -218,13 +218,13 @@ TEST_CASE("flat_multimap") {
 
             REQUIRE(s0.empty());
             REQUIRE_FALSE(s0.size());
-            REQUIRE(s0.max_size() == std::allocator<std::pair<int,unsigned>>().max_size());
+            REQUIRE(s0.max_size() == std::vector<std::pair<int,unsigned>>().max_size());
 
             s0.insert({2,42});
 
             REQUIRE_FALSE(s0.empty());
             REQUIRE(s0.size() == 1u);
-            REQUIRE(s0.max_size() == std::allocator<std::pair<int,unsigned>>().max_size());
+            REQUIRE(s0.max_size() == std::vector<std::pair<int,unsigned>>().max_size());
 
             s0.insert({2,84});
             REQUIRE(s0.size() == 2u);
@@ -236,7 +236,7 @@ TEST_CASE("flat_multimap") {
 
             REQUIRE(s0.empty());
             REQUIRE_FALSE(s0.size());
-            REQUIRE(s0.max_size() == std::allocator<std::pair<int,unsigned>>().max_size());
+            REQUIRE(s0.max_size() == std::vector<std::pair<int,unsigned>>().max_size());
         }
 
         {
diff --git a/untests/flat_multiset_tests.cpp b/untests/flat_multiset_tests.cpp
index 2470283..aba9eea 100644
--- a/untests/flat_multiset_tests.cpp
+++ b/untests/flat_multiset_tests.cpp
@@ -204,13 +204,13 @@ TEST_CASE("flat_multiset") {
 
             REQUIRE(s0.empty());
             REQUIRE_FALSE(s0.size());
-            REQUIRE(s0.max_size() == std::allocator<int>().max_size());
+            REQUIRE(s0.max_size() == std::vector<int>().max_size());
 
             s0.insert(42);
 
             REQUIRE_FALSE(s0.empty());
             REQUIRE(s0.size() == 1u);
-            REQUIRE(s0.max_size() == std::allocator<int>().max_size());
+            REQUIRE(s0.max_size() == std::vector<int>().max_size());
 
             s0.insert(42);
             REQUIRE(s0.size() == 2u);
@@ -222,7 +222,7 @@ TEST_CASE("flat_multiset") {
 
             REQUIRE(s0.empty());
             REQUIRE_FALSE(s0.size());
-            REQUIRE(s0.max_size() == std::allocator<int>().max_size());
+            REQUIRE(s0.max_size() == std::vector<int>().max_size());
         }
 
         {
diff --git a/untests/flat_set_tests.cpp b/untests/flat_set_tests.cpp
index 8b521b8..ebbb99d 100644
--- a/untests/flat_set_tests.cpp
+++ b/untests/flat_set_tests.cpp
@@ -204,13 +204,13 @@ TEST_CASE("flat_set") {
 
             REQUIRE(s0.empty());
             REQUIRE_FALSE(s0.size());
-            REQUIRE(s0.max_size() == std::allocator<int>().max_size());
+            REQUIRE(s0.max_size() == std::vector<int>().max_size());
 
             s0.insert(42);
 
             REQUIRE_FALSE(s0.empty());
             REQUIRE(s0.size() == 1u);
-            REQUIRE(s0.max_size() == std::allocator<int>().max_size());
+            REQUIRE(s0.max_size() == std::vector<int>().max_size());
 
             s0.insert(42);
             REQUIRE(s0.size() == 1u);
@@ -222,7 +222,7 @@ TEST_CASE("flat_set") {
 
             REQUIRE(s0.empty());
             REQUIRE_FALSE(s0.size());
-            REQUIRE(s0.max_size() == std::allocator<int>().max_size());
+            REQUIRE(s0.max_size() == std::vector<int>().max_size());
         }
 
         {