diff --git a/scripts/checks.m4 b/scripts/checks.m4
index ae254f3f..58ade5e5 100644
--- a/scripts/checks.m4
+++ b/scripts/checks.m4
@@ -284,6 +284,7 @@ AC_DEFUN([TORRENT_WITH_LUA], [
       AX_LUA_LIBS
       AX_LUA_HEADERS
       AC_DEFINE(HAVE_LUA, 1, Use LUA.)
+      AC_DEFINE_UNQUOTED(PACKAGE_DATADIR, ["${prefix}/share/rtorrent"], Use LUA.)
       LIBS="$LIBS $LUA_LIB"
       CXXFLAGS="$CXXFLAGS $LUA_INCLUDE"
     fi
diff --git a/src/Makefile.am b/src/Makefile.am
index 6b2f1c9a..9dee76b5 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -196,4 +196,4 @@ libsub_root_a_SOURCES = \
 	thread_worker.h
 
 
-AM_CPPFLAGS = -I$(srcdir) -I$(top_srcdir) -DPACKAGE_DATADIR=\"$(pkgdatadir)\"
+AM_CPPFLAGS = -I$(srcdir) -I$(top_srcdir)