diff --git a/cmake/Libraries.cmake b/cmake/Libraries.cmake
index 10f05d2bd..ca524a2ab 100644
--- a/cmake/Libraries.cmake
+++ b/cmake/Libraries.cmake
@@ -124,7 +124,6 @@ macro(configure_unix_libs)
   check_include_file_cxx(sstream HAVE_SSTREAM)
 
   check_include_files(locale.h HAVE_LOCALE_H)
-  check_include_files(string.h HAVE_STRING_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/stat.h HAVE_SYS_STAT_H)
diff --git a/src/lib/config.h.in b/src/lib/config.h.in
index e00d4feb2..421084ec7 100644
--- a/src/lib/config.h.in
+++ b/src/lib/config.h.in
@@ -56,9 +56,6 @@
 /* Define to 1 if you have the <sstream> header file. */
 #cmakedefine HAVE_SSTREAM @HAVE_SSTREAM@
 
-/* Define to 1 if you have the <string.h> header file. */
-#cmakedefine HAVE_STRING_H @HAVE_STRING_H@
-
 /* Define to 1 if you have the <sys/select.h> header file. */
 #cmakedefine HAVE_SYS_SELECT_H @HAVE_SYS_SELECT_H@