diff --git a/luasocket-scm-0.rockspec b/luasocket-scm-0.rockspec
index 6cdb0ce..9681a97 100644
--- a/luasocket-scm-0.rockspec
+++ b/luasocket-scm-0.rockspec
@@ -96,6 +96,7 @@ local function make_plat(plat)
     modules["socket.serial"] = {
       sources = {
         "src/buffer.c"
+        , "src/compat.c"
         , "src/auxiliar.c"
         , "src/options.c"
         , "src/timeout.c"
diff --git a/rockspec/luasocket-3.0rc2-1.rockspec b/rockspec/luasocket-3.0rc2-1.rockspec
index 2b299f3..7d0714c 100644
--- a/rockspec/luasocket-3.0rc2-1.rockspec
+++ b/rockspec/luasocket-3.0rc2-1.rockspec
@@ -96,6 +96,7 @@ local function make_plat(plat)
     modules["socket.serial"] = {
       sources = {
         "src/buffer.c"
+        , "src/compat.c"
         , "src/auxiliar.c"
         , "src/options.c"
         , "src/timeout.c"