diff --git a/configure.ac b/configure.ac
index 00fd742..30d9b86 100755
--- a/configure.ac
+++ b/configure.ac
@@ -5,7 +5,7 @@
 AC_CONFIG_HEADERS([config.h])
 AM_INIT_AUTOMAKE([subdir-objects -Wall -Werror foreign dist-xz])
 AM_SILENT_RULES([yes])
-
+AC_LANG([C++])
 
 # Checks for programs.
 AC_PROG_CXX