diff --git a/cmake/modules/FindWSWinLibs.cmake b/cmake/modules/FindWSWinLibs.cmake
index 3442e84ed0..f98f58c1a8 100644
--- a/cmake/modules/FindWSWinLibs.cmake
+++ b/cmake/modules/FindWSWinLibs.cmake
@@ -15,8 +15,8 @@ function(FindWSWinLibs _WS_LIB_SEARCH_PATH _LIB_HINT_VAR)
     set( _PROJECT_LIB_DIR "${_WS_BASE_DIR}/wireshark-${_WS_TARGET_PLATFORM}-libs" )
     file( GLOB _SUBDIR "${_PROJECT_LIB_DIR}/*" )
     foreach( _DIR ${_SUBDIR} )
-      if( IS_DIRECTORY ${dir} )
-        if( "${_DIR}" matches ".*/${_WS_LIB_SEARCH_PATH}" )
+      if( IS_DIRECTORY ${_DIR} )
+        if( "${_DIR}" MATCHES ".*/${_WS_LIB_SEARCH_PATH}" )
           set( ${_LIB_HINT_VAR} ${_DIR} PARENT_SCOPE )
         endif()
       endif()