diff --git a/cmake/Libraries.cmake b/cmake/Libraries.cmake
index 2a79d5cc5..87f1bfdeb 100644
--- a/cmake/Libraries.cmake
+++ b/cmake/Libraries.cmake
@@ -89,7 +89,6 @@ macro(configure_unix_libs)
   include(CheckSymbolExists)
   include(CheckCSourceCompiles)
 
-  check_include_files(locale.h HAVE_LOCALE_H)
   check_include_files(sys/select.h HAVE_SYS_SELECT_H)
   check_include_files(sys/socket.h HAVE_SYS_SOCKET_H)
   check_include_files(sys/time.h HAVE_SYS_TIME_H)
diff --git a/src/lib/Config.h.in b/src/lib/Config.h.in
index 840e7bc97..3ecdbe253 100644
--- a/src/lib/Config.h.in
+++ b/src/lib/Config.h.in
@@ -19,9 +19,6 @@
 /* Define if you have the `inet_aton` function. */
 #cmakedefine HAVE_INET_ATON @HAVE_INET_ATON@
 
-/* Define to 1 if you have the <locale.h> header file. */
-#cmakedefine HAVE_LOCALE_H @HAVE_LOCALE_H@
-
 /* Define if you have the `nanosleep` function. */
 #cmakedefine HAVE_NANOSLEEP @HAVE_NANOSLEEP@