diff --git a/src/configure.in b/src/configure.in
index b6c77da..ff1bd0c 100644
--- a/src/configure.in
+++ b/src/configure.in
@@ -2148,6 +2148,7 @@
 dnl Checks for typedefs, structures, and compiler characteristics.
 AC_PROG_GCC_TRADITIONAL
 AC_C_CONST
+AC_C_VOLATILE
 AC_TYPE_MODE_T
 AC_TYPE_OFF_T
 AC_TYPE_PID_T