diff --git a/configure.ac b/configure.ac
index 014b56521..d6d8156d0 100644
--- a/configure.ac
+++ b/configure.ac
@@ -2658,6 +2658,7 @@ if test X"$OPT_LIBRTMP" != Xno; then
     ;;
   *)
     dnl use the given --with-librtmp spot
+    LIB_RTMP="-lrtmp"
     PREFIX_RTMP=$OPT_LIBRTMP
     ;;
   esac