diff --git a/Help/command/execute_process.rst b/Help/command/execute_process.rst
index c02dbba894..2591dba149 100644
--- a/Help/command/execute_process.rst
+++ b/Help/command/execute_process.rst
@@ -140,12 +140,15 @@ Options:
  ``NONE``
    Perform no decoding.  This assumes that the process output is encoded
    in the same way as CMake's internal encoding (UTF-8).
-   This is the default.
+
+   This was the default in CMake 3.14 and older.
 
  ``AUTO``
    Use the current active console's codepage or if that isn't
    available then use ANSI.
 
+   This is the default since CMake 3.15.
+
  ``ANSI``
    Use the ANSI codepage.
 
diff --git a/Tests/RunCMake/execute_process/EncodingDefault-stderr.txt b/Tests/RunCMake/execute_process/EncodingDefault-stderr.txt
new file mode 100644
index 0000000000..b4cf27ab7c
--- /dev/null
+++ b/Tests/RunCMake/execute_process/EncodingDefault-stderr.txt
@@ -0,0 +1,2 @@
+Chinese
+注意
diff --git a/Tests/RunCMake/execute_process/EncodingDefault.cmake b/Tests/RunCMake/execute_process/EncodingDefault.cmake
new file mode 100644
index 0000000000..60b1eb6a75
--- /dev/null
+++ b/Tests/RunCMake/execute_process/EncodingDefault.cmake
@@ -0,0 +1,3 @@
+# No explicit ENCODING option; fall back to default.
+set(CODEPAGE 54936)
+include(${CMAKE_CURRENT_LIST_DIR}/Encoding.cmake)
diff --git a/Tests/RunCMake/execute_process/RunCMakeTest.cmake b/Tests/RunCMake/execute_process/RunCMakeTest.cmake
index bbf139ea5c..b3ebdcaa53 100644
--- a/Tests/RunCMake/execute_process/RunCMakeTest.cmake
+++ b/Tests/RunCMake/execute_process/RunCMakeTest.cmake
@@ -9,6 +9,7 @@ run_cmake_command(MergeOutputVars ${CMAKE_COMMAND} -P ${RunCMake_SOURCE_DIR}/Mer
 
 run_cmake(EncodingMissing)
 if(TEST_ENCODING_EXE)
+  run_cmake_script(EncodingDefault -DTEST_ENCODING_EXE=${TEST_ENCODING_EXE})
   run_cmake_script(EncodingAUTO -DTEST_ENCODING_EXE=${TEST_ENCODING_EXE})
   run_cmake_script(EncodingUTF-8 -DTEST_ENCODING_EXE=${TEST_ENCODING_EXE})
   run_cmake_script(EncodingUTF8 -DTEST_ENCODING_EXE=${TEST_ENCODING_EXE})