diff --git a/source3/configure.in b/source3/configure.in
index cce21a29b21..b52a1b46670 100644
--- a/source3/configure.in
+++ b/source3/configure.in
@@ -1869,6 +1869,7 @@ AC_MSG_RESULT([$SHLD])
 AC_MSG_CHECKING([LDSHFLAGS])
 AC_MSG_RESULT([$LDSHFLAGS])
 
+AC_DEFINE_UNQUOTED(SHLIBEXT, "$SHLIBEXT", [Shared library extension])
 AC_MSG_CHECKING([SHLIBEXT])
 AC_MSG_RESULT([$SHLIBEXT])
 AC_MSG_CHECKING([SONAMEFLAG])