diff --git a/configure.in b/configure.in
index 97f8af6..f9795d6 100644
--- a/configure.in
+++ b/configure.in
@@ -15,7 +15,7 @@ dnl Checks for libraries.
 dnl Checks for header files.
 AC_HEADER_STDC
 AC_CHECK_HEADERS(fcntl.h unistd.h)
-AM_SYS_POSIX_TERMIOS
+AC_SYS_POSIX_TERMIOS
 
 dnl Initialize intltool