diff --git a/lib/token.cpp b/lib/token.cpp
index b11e12bf0a7..c659d76c664 100644
--- a/lib/token.cpp
+++ b/lib/token.cpp
@@ -204,7 +204,6 @@ static const std::unordered_set<std::string> stdTypes = { "bool"
                                                           , "int"
                                                           , "long"
                                                           , "short"
-                                                          , "size_t"
                                                           , "void"
                                                           , "wchar_t"
                                                           , "signed"
diff --git a/test/testtoken.cpp b/test/testtoken.cpp
index 83a514eb963..cd5afe716f8 100644
--- a/test/testtoken.cpp
+++ b/test/testtoken.cpp
@@ -1059,7 +1059,6 @@ class TestToken : public TestFixture {
         standard_types.emplace_back("long");
         standard_types.emplace_back("float");
         standard_types.emplace_back("double");
-        standard_types.emplace_back("size_t");
 
         for (auto test_op = standard_types.cbegin(); test_op != standard_types.cend(); ++test_op) {
             auto tokensFrontBack = std::make_shared<TokensFrontBack>();
@@ -1488,8 +1487,6 @@ class TestToken : public TestFixture {
             TokenList list_c{settingsDefault, Standards::Language::C};
             auto tokensFrontBack = std::make_shared<TokensFrontBack>();
             Token tok(list_c, std::move(tokensFrontBack));
-            tok.str("size_t"); // not treated as keyword in TokenList::isKeyword()
-            assert_tok(&tok, Token::Type::eType, /*l=*/ false, /*std=*/ true);
         }
     }
 
@@ -1506,8 +1503,6 @@ class TestToken : public TestFixture {
             TokenList list_cpp{settingsDefault, Standards::Language::CPP};
             auto tokensFrontBack = std::make_shared<TokensFrontBack>();
             Token tok(list_cpp, std::move(tokensFrontBack));
-            tok.str("size_t");
-            assert_tok(&tok, Token::Type::eType, /*l=*/ false, /*std=*/ true);
         }
     }
 
@@ -1515,8 +1510,6 @@ class TestToken : public TestFixture {
     {
         auto tokensFrontBack = std::make_shared<TokensFrontBack>();
         Token tok(list, std::move(tokensFrontBack));
-        tok.str("size_t");
-        assert_tok(&tok, Token::Type::eType, false, true);
         tok.str("long");
         assert_tok(&tok, Token::Type::eType, false, true);
     }
diff --git a/test/testtokenize.cpp b/test/testtokenize.cpp
index 7b2bee0d80e..edffe2aee39 100644
--- a/test/testtokenize.cpp
+++ b/test/testtokenize.cpp
@@ -7845,6 +7845,8 @@ class TestTokenizer : public TestFixture {
                                              "}\n"));
 
         ignore_errout();
+
+        ASSERT_EQUALS(";", tokenizeAndStringify("typedef std::size_t size_t;\n")); // #14809
     }
 
 
diff --git a/test/testvarid.cpp b/test/testvarid.cpp
index 64b7b6664be..72b9ca0d09c 100644
--- a/test/testvarid.cpp
+++ b/test/testvarid.cpp
@@ -2840,7 +2840,7 @@ class TestVarID : public TestFixture {
     void varid_using() {
         // #3648
         const char code[] = "using std::size_t;";
-        const char expected[] = "1: using unsigned long ;\n";
+        const char expected[] = "1: ;\n";
         ASSERT_EQUALS(expected, tokenize(code));
     }