diff --git a/mlir/docs/CMakeLists.txt b/mlir/docs/CMakeLists.txt
index 3232592e8f3e..36cd3f998388 100644
--- a/mlir/docs/CMakeLists.txt
+++ b/mlir/docs/CMakeLists.txt
@@ -90,14 +90,3 @@ if (LLVM_ENABLE_DOXYGEN)
 endif()
 endif()
 
-if (LLVM_ENABLE_SPHINX)
-  include(AddSphinxTarget)
-  if (SPHINX_FOUND)
-    if (${SPHINX_OUTPUT_HTML})
-      add_sphinx_target(html mlir)
-    endif()
-    if (${SPHINX_OUTPUT_MAN})
-      add_sphinx_target(man mlir)
-    endif()
-  endif()
-endif()