diff --git a/configure.in b/configure.in
index e8ac6962..8feb2698 100644
--- a/configure.in
+++ b/configure.in
@@ -239,7 +239,7 @@ if test "x$GLIB_DIR" != "x"; then
   AC_MSG_RESULT([yes, using it])
 
   full_glib_dir="`pwd`/$GLIB_DIR"
-  GLIB_CFLAGS="-I$full_glib_dir"
+  GLIB_CFLAGS="-I$full_glib_dir -I$full_glib_dir/gmodule"
   GLIB_LIBS="$full_glib_dir/.libs/libglib.a $full_glib_dir/gmodule/.libs/libgmodule.a"
   AC_SUBST(GLIB_DIR)
   AC_SUBST(GLIB_CFLAGS)