diff --git a/packages/babel-cli/test/fixtures/babel/error --keep-file-extension --out-file-extension/options.json b/packages/babel-cli/test/fixtures/babel/error --keep-file-extension --out-file-extension/options.json
new file mode 100644
index 000000000000..8ad9743c9dbc
--- /dev/null
+++ b/packages/babel-cli/test/fixtures/babel/error --keep-file-extension --out-file-extension/options.json	
@@ -0,0 +1,4 @@
+{
+  "args": ["--keep-file-extension", "--out-file-extension", ".mjs"],
+  "stderrContains": true
+}
diff --git a/packages/babel-cli/test/fixtures/babel/error --keep-file-extension --out-file-extension/stderr.txt b/packages/babel-cli/test/fixtures/babel/error --keep-file-extension --out-file-extension/stderr.txt
new file mode 100644
index 000000000000..acc6f8edb8bb
--- /dev/null
+++ b/packages/babel-cli/test/fixtures/babel/error --keep-file-extension --out-file-extension/stderr.txt	
@@ -0,0 +1 @@
+--out-file-extension cannot be used with --keep-file-extension