diff --git a/cmake/QtProcessConfigureArgs.cmake b/cmake/QtProcessConfigureArgs.cmake
index 8fa4be2af1..2bc0f71bd0 100644
--- a/cmake/QtProcessConfigureArgs.cmake
+++ b/cmake/QtProcessConfigureArgs.cmake
@@ -985,6 +985,14 @@ endforeach()
 
 push("${MODULE_ROOT}")
 
+if(INPUT_sysroot)
+    qtConfAddWarning("The -sysroot option is deprecated and no longer has any effect. "
+                     "It is recommended to use a toolchain file instead, i.e., "
+                     "-DCMAKE_TOOLCHAIN_FILE=<filename>. "
+                     "Alternatively, you may use -DCMAKE_SYSROOT option "
+                     "to pass the sysroot to CMake.\n")
+endif()
+
 # Restore the escaped semicolons in arguments that are lists
 list(TRANSFORM cmake_args REPLACE "\\[\\[;\\]\\]" "\\\\;")
 
diff --git a/cmake/configure-cmake-mapping.md b/cmake/configure-cmake-mapping.md
index af7e741dd0..f3b3ffb3f4 100644
--- a/cmake/configure-cmake-mapping.md
+++ b/cmake/configure-cmake-mapping.md
@@ -80,8 +80,6 @@ The following table describes the mapping of configure options to CMake argument
 | -mp                                   | n/a                                               |                                                                 |
 | -warnings-are-errors                  | -DWARNINGS_ARE_ERRORS=ON                          |                                                                 |
 | -silent                               | n/a                                               |                                                                 |
-| -sysroot <dir>                        | -DCMAKE_SYSROOT=<dir>                             | Should be provided by a toolchain file that's                   |
-|                                       |                                                   | passed via -DCMAKE_TOOLCHAIN_FILE=<filename>                    |
 | -no-gcc-sysroot                       | n/a                                               | The corresponding CMake variables are CMAKE_SYSROOT_LINK        |
 |                                       |                                                   | and CMAKE_SYSROOT_COMPILE.                                      |
 |                                       |                                                   | They are usually set in a toolchain file.                       |
diff --git a/config_help.txt b/config_help.txt
index f63e52b8a8..f35ec4cc24 100644
--- a/config_help.txt
+++ b/config_help.txt
@@ -157,8 +157,6 @@ Build options:
 
 Build environment:
 
-  -sysroot <dir> ....... Set <dir> as the target sysroot
-
   -pkg-config .......... Use pkg-config [auto] (Unix only)
 
   -D <string> .......... Pass additional preprocessor define