diff --git a/build/lua.m4 b/build/lua.m4
index 75b23520..49a54b48 100644
--- a/build/lua.m4
+++ b/build/lua.m4
@@ -68,7 +68,8 @@ else
         case $LUA_PKG_VERSION in
            (5.1*) LUA_CFLAGS="-DWITH_LUA_5_1 ${LUA_CFLAGS}" ; lua_5_1=1 ;;
            (5.2*) LUA_CFLAGS="-DWITH_LUA_5_2 ${LUA_CFLAGS}" ; lua_5_2=1 ;;
-           (2.*) LUA_CFLAGS="-DWITH_LUA_5_1 ${LUA_CFLAGS}" ; lua_5_1=1 ;;
+           (2.0*) LUA_CFLAGS="-DWITH_LUA_5_1 ${LUA_CFLAGS}" ; lua_5_1=1 ;;
+           (2.1*) LUA_CFLAGS="-DWITH_LUA_5_1 -DWITH_LUA_JIT_2_1 ${LUA_CFLAGS}" ; lua_5_1=1 ;;
         esac
            AC_MSG_NOTICE([LUA pkg-config version: ${LUA_PKG_VERSION}])
         fi
diff --git a/src/engine/lua.h b/src/engine/lua.h
index b0972dfc..b1b77e2d 100644
--- a/src/engine/lua.h
+++ b/src/engine/lua.h
@@ -102,7 +102,7 @@ static const struct luaL_Reg mscLuaLib[] = {
 }  // namespace modsecurity
 
 #ifdef WITH_LUA
-#if defined LUA_VERSION_NUM && LUA_VERSION_NUM < 502
+#if defined LUA_VERSION_NUM && LUA_VERSION_NUM < 502 && !defined WITH_LUA_JIT_2_1
 /*
 ** Adapted from Lua 5.2.0
 */