diff --git a/.gitignore b/.gitignore
index 75afb3023..e41ec8cbd 100644
--- a/.gitignore
+++ b/.gitignore
@@ -7,9 +7,7 @@
 /.versions
 
 # ignore ninja.exe copied from .cipd_bin.
-# TODO(crbug.com/931218): checkin ninja.exe for issues that can't ensure
-# ninja.exe as expected.
-# /ninja.exe
+/ninja.exe
 
 # Ignore "disable auto update" sentinel file.
 .disable_auto_update
diff --git a/cipd_bin_setup.bat b/cipd_bin_setup.bat
index 8ace8869d..3936fc0d5 100644
--- a/cipd_bin_setup.bat
+++ b/cipd_bin_setup.bat
@@ -5,5 +5,4 @@
 
 call "%~dp0\cipd.bat" ensure -log-level warning -ensure-file "%~dp0\cipd_manifest.txt" -root "%~dp0\.cipd_bin"
 :: copy ninja.exe to the root since many places assume ninja.exe exists in depot_tools.
-:: TODO(crbug.com/931218): check in ninja.exe for now.
-:: copy /y "%~dp0\.cipd_bin\ninja.exe" "%~dp0\ninja.exe" > nul
+copy /y "%~dp0\.cipd_bin\ninja.exe" "%~dp0\ninja.exe" > nul
diff --git a/ninja.exe b/ninja.exe
deleted file mode 100644
index 799949ed6..000000000
Binary files a/ninja.exe and /dev/null differ