diff --git a/configure.ac b/configure.ac
index 61ec6da..3030d1d 100644
--- a/configure.ac
+++ b/configure.ac
@@ -97,12 +97,12 @@ esac
 
 AC_SUBST(SP_PKGLIBS)
 
-# Define size_t if not defined as as standard.
+# Define size_t if not defined as standard.
 AC_TYPE_SIZE_T
 
 # Check for specific termios structures.
-AC_CHECK_TYPE([struct termios2],[AC_DEFINE(HAVE_TERMIOS2, 1)],[],[[#include <linux/termios.h>]])
-AC_CHECK_TYPE([struct termiox],[AC_DEFINE(HAVE_TERMIOX, 1)],[],[[#include <linux/termios.h>]])
+AC_CHECK_TYPE([struct termios2], [AC_DEFINE(HAVE_TERMIOS2, 1)], [], [[#include <linux/termios.h>]])
+AC_CHECK_TYPE([struct termiox], [AC_DEFINE(HAVE_TERMIOX, 1)], [], [[#include <linux/termios.h>]])
 
 AC_SUBST(MAKEFLAGS, '--no-print-directory')
 AC_SUBST(AM_LIBTOOLFLAGS, '--silent')