diff --git a/CMakeLists.txt b/CMakeLists.txt
index 5139c0a478e788..f3531e9ad9fd26 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -490,10 +490,6 @@ if(USE_SYSTEM_LIBS)
   endif()
 endif()
 
-# Used when building Caffe2 through setup.py
-option(BUILDING_WITH_TORCH_LIBS
-       "Tell cmake if Caffe2 is being built alongside torch libs" ON)
-
 # /Z7 override option When generating debug symbols, CMake default to use the
 # flag /Zi. However, it is not compatible with sccache. So we rewrite it off.
 # But some users don't use sccache; this override is for them.
diff --git a/scripts/build_windows.bat b/scripts/build_windows.bat
index fbdade94353554..60bfebad08c016 100644
--- a/scripts/build_windows.bat
+++ b/scripts/build_windows.bat
@@ -22,10 +22,6 @@ if NOT DEFINED BUILD_SHARED_LIBS (
   )
 )
 
-IF NOT DEFINED BUILDING_WITH_TORCH_LIBS (
-  set BUILDING_WITH_TORCH_LIBS=OFF
-)
-
 if NOT DEFINED CAFFE2_STATIC_LINK_CUDA (
   set CAFFE2_STATIC_LINK_CUDA=OFF
 )
diff --git a/tools/setup_helpers/cmake.py b/tools/setup_helpers/cmake.py
index d50d9d54739979..4b605fe597505a 100644
--- a/tools/setup_helpers/cmake.py
+++ b/tools/setup_helpers/cmake.py
@@ -204,7 +204,6 @@ def generate(
                     "UBSAN_FLAGS",
                     "BLAS",
                     "WITH_BLAS",
-                    "BUILDING_WITH_TORCH_LIBS",
                     "CUDA_HOST_COMPILER",
                     "CUDA_NVCC_EXECUTABLE",
                     "CUDA_SEPARABLE_COMPILATION",