diff --git a/configure.in b/configure.ac
similarity index 99%
rename from configure.in
rename to configure.ac
index e086b983d..2ad06db93 100644
--- a/configure.in
+++ b/configure.ac
@@ -25,7 +25,7 @@
 
 AC_PREREQ(2.56)
 AC_INIT(WeeChat, 0.4.2-dev, flashcode@flashtux.org)
-AC_CONFIG_SRCDIR([configure.in])
+AC_CONFIG_SRCDIR([configure.ac])
 AM_CONFIG_HEADER(config.h)
 AM_INIT_AUTOMAKE
 LICENSE="GPL3"