diff --git a/CMakeLists.txt b/CMakeLists.txt
index 8ffed12..fc52757 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -258,7 +258,7 @@ if(SEAL_USE_INTEL_HEXL)
         message(STATUS "Intel HEXL: download ...")
         seal_fetch_thirdparty_content(ExternalIntelHEXL)
     else()
-        find_package(HEXL 1)
+        find_package(HEXL CONFIG REQUIRED)
         if(NOT TARGET HEXL::hexl)
             message(FATAL_ERROR "Intel HEXL: not found")
         endif()