diff --git a/configure.in b/configure.in
index a048585c..a9fce574 100644
--- a/configure.in
+++ b/configure.in
@@ -1,7 +1,7 @@
 dnl Init.
 AC_INIT(dosbox,0.57)
+AC_PREREQ(2.50)
 AC_CONFIG_SRCDIR(README)
-AC_RREREQ(2.50)
 
 dnl Detect the canonical host and target build environment
 AC_CANONICAL_HOST