diff --git a/3d_party/mongo-c-driver/install.cmd b/3d_party/mongo-c-driver/install.cmd
index 08a32ed8b3beb2d05b66a8005c772dc6a1f3025b..6ee758b070dd44636b93d7ccba0db53cc3489d6d 100644
--- a/3d_party/mongo-c-driver/install.cmd
+++ b/3d_party/mongo-c-driver/install.cmd
@@ -7,14 +7,6 @@ SET dir=c:\tmp\mongo-c-driver-1.15.2
 set mypath=%cd%
 cd /d %dir%
 
-:: install libbson
-cd src\libbson
-cmake "-DCMAKE_INSTALL_PREFIX=C:\mongo-c-driver" ^
-      "-DCMAKE_BUILD_TYPE=Release" ^
-      "-DCMAKE_C_FLAGS_RELEASE=/MT"
-cmake --build . --config Release
-cmake --build . --target install --config Release
-
 :: install mongoc
 cd %dir%
 cmake "-DCMAKE_INSTALL_PREFIX=C:\mongo-c-driver" ^