diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index 37f2a9b7..fe595d3c 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -223,6 +223,9 @@ foreach(_libdir IN LISTS CMAKE_SYSTEM_PREFIX_PATH)
 endforeach()
 
 foreach(_libdir IN LISTS LIBSSH2_LIBDIRS)
+  if(NOT CMAKE_VERSION VERSION_LESS 3.20)
+    cmake_path(SET _libdir NORMALIZE "${_libdir}")
+  endif()
   list(FIND _sys_libdirs "${_libdir}" _libdir_index)
   if(_libdir_index LESS 0)
     list(APPEND _ldflags "-L${_libdir}")
@@ -257,6 +260,9 @@ foreach(_lib IN LISTS _implicit_libs LIBSSH2_LIBS)
     get_filename_component(_libdir ${_lib} DIRECTORY)
     get_filename_component(_libname ${_lib} NAME_WE)
     if(_libname MATCHES "^lib")
+      if(NOT CMAKE_VERSION VERSION_LESS 3.20)
+        cmake_path(SET _libdir NORMALIZE "${_libdir}")
+      endif()
       list(FIND _sys_libdirs "${_libdir}" _libdir_index)
       if(_libdir_index LESS 0)
         list(APPEND _ldflags "-L${_libdir}")