diff --git a/src/corelib/configure.cmake b/src/corelib/configure.cmake
index 0b80923cf6b..7e0c05b0148 100644
--- a/src/corelib/configure.cmake
+++ b/src/corelib/configure.cmake
@@ -552,6 +552,28 @@ int main(void)
 }
 ")
 
+# std::format support
+qt_config_compile_test(cxx20_format
+    LABEL "C++20 std::format support"
+    CODE
+"#include <format>
+#include <string>
+
+#if !defined(__cpp_lib_format) || (__cpp_lib_format < 202106L)
+#error
+#endif
+
+int main(void)
+{
+    /* BEGIN TEST: */
+const auto s = std::format(\"{}\", 1);
+    /* END TEST: */
+    return 0;
+}
+"
+    CXX_STANDARD 20
+)
+
 # <stacktrace>
 qt_config_compile_test(cxx23_stacktrace
     LABEL "C++23 <stacktrace> support"
@@ -849,6 +871,11 @@ qt_feature("backtrace" PRIVATE
     LABEL "backtrace"
     CONDITION UNIX AND QT_FEATURE_regularexpression AND WrapBacktrace_FOUND
 )
+qt_feature("cxx20_format" PRIVATE
+    LABEL "C++20 std::format support"
+    CONDITION TEST_cxx20_format # intentionally not checking QT_FEATURE_cxx20!
+    AUTODETECT TRUE
+)
 qt_feature("cxx23_stacktrace" PRIVATE
     LABEL "C++23 <stacktrace>"
     CONDITION TEST_cxx23_stacktrace AND QT_FEATURE_cxx2b
diff --git a/tests/auto/corelib/global/qfloat16/CMakeLists.txt b/tests/auto/corelib/global/qfloat16/CMakeLists.txt
index f659036073c..2d4afc6569c 100644
--- a/tests/auto/corelib/global/qfloat16/CMakeLists.txt
+++ b/tests/auto/corelib/global/qfloat16/CMakeLists.txt
@@ -19,7 +19,7 @@ qt_internal_add_test(tst_qfloat16
 )
 
 # To test std::format support, if possible
-if(NOT VXWORKS)
+if(QT_FEATURE_cxx20_format)
     set_target_properties(tst_qfloat16
         PROPERTIES
             CXX_STANDARD 20