diff --git a/configure.ac b/configure.ac
index 54d0405aad4407c05a61f904c531d4ae9f7d4cd1..9f0f4f0fb34c2c48ac239dd4d1c820b6d5f95c01 100644
--- a/configure.ac
+++ b/configure.ac
@@ -62,7 +62,7 @@ AC_SUBST(OPUS_LT_REVISION)
 AC_SUBST(OPUS_LT_AGE)
 
 AM_INIT_AUTOMAKE($PACKAGE, $VERSION, no-define)
-AM_MAINTAINER_MODE
+AM_MAINTAINER_MODE([enable])
 
 AC_CANONICAL_HOST
 AC_MINGW32