diff --git a/CMakeLists.txt b/CMakeLists.txt
index 2419de626c..43fb01a48a 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -2204,8 +2204,7 @@ if(NOT CURL_DISABLE_INSTALL)
             if(CMAKE_VERSION VERSION_GREATER_EQUAL 3.20)
               cmake_path(SET _libdir NORMALIZE "${_libdir}")
             endif()
-            list(FIND _sys_libdirs "${_libdir}" _libdir_index)
-            if(_libdir_index LESS 0)
+            if(NOT _libdir IN_LIST _sys_libdirs)
               list(APPEND _ldflags "-L${_libdir}")
             endif()
             string(REGEX REPLACE "^lib" "" _libname "${_libname}")
@@ -2233,8 +2232,7 @@ if(NOT CURL_DISABLE_INSTALL)
     if(CMAKE_VERSION VERSION_GREATER_EQUAL 3.20)
       cmake_path(SET _libdir NORMALIZE "${_libdir}")
     endif()
-    list(FIND _sys_libdirs "${_libdir}" _libdir_index)
-    if(_libdir_index LESS 0)
+    if(NOT _libdir IN_LIST _sys_libdirs)
       list(APPEND _ldflags "-L${_libdir}")
     endif()
   endforeach()