diff --git a/cmake/Libraries.cmake b/cmake/Libraries.cmake
index c097077e7..2a79d5cc5 100644
--- a/cmake/Libraries.cmake
+++ b/cmake/Libraries.cmake
@@ -89,8 +89,6 @@ macro(configure_unix_libs)
   include(CheckSymbolExists)
   include(CheckCSourceCompiles)
 
-  check_include_file_cxx(sstream HAVE_SSTREAM)
-
   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)
diff --git a/src/lib/Config.h.in b/src/lib/Config.h.in
index 64eddb243..840e7bc97 100644
--- a/src/lib/Config.h.in
+++ b/src/lib/Config.h.in
@@ -37,9 +37,6 @@
 /* Define if your compiler defines socklen_t. */
 #cmakedefine HAVE_SOCKLEN_T @HAVE_SOCKLEN_T@
 
-/* Define to 1 if you have the <sstream> header file. */
-#cmakedefine HAVE_SSTREAM @HAVE_SSTREAM@
-
 /* Define to 1 if you have the <sys/select.h> header file. */
 #cmakedefine HAVE_SYS_SELECT_H @HAVE_SYS_SELECT_H@