diff --git a/cmake/external/eigen.cmake b/cmake/external/eigen.cmake
index b123adb..aab2483 100644
--- a/cmake/external/eigen.cmake
+++ b/cmake/external/eigen.cmake
@@ -7,8 +7,13 @@ else ()
         eigen
         URL ${DEP_URL_eigen}
         URL_HASH SHA1=${DEP_SHA1_eigen}
+	FIND_PACKAGE_ARGS NAMES Eigen3
     )
 
-    FetchContent_Populate(eigen)
-    set(eigen_INCLUDE_DIRS  "${eigen_SOURCE_DIR}")
+    FetchContent_MakeAvailable(eigen)
+    add_library(eigen ALIAS Eigen3::Eigen)
+    # Onnxruntime doesn't always use `eigen` as a target in
+    # `target_link_libraries`, sometimes it just uses
+    # `target_include_directories`:
+    get_target_property(eigen_INCLUDE_DIRS Eigen3::Eigen INTERFACE_INCLUDE_DIRECTORIES)
 endif()