diff --git a/src/context.c b/src/context.c
index 821b675..5bd757d 100644
--- a/src/context.c
+++ b/src/context.c
@@ -35,6 +35,29 @@ typedef const SSL_METHOD LSEC_SSL_METHOD;
 typedef       SSL_METHOD LSEC_SSL_METHOD;
 #endif
 
+
+/*-- Compat - Lua 5.1 --------------------------------------------------------*/
+
+#if (LUA_VERSION_NUM == 501)
+
+#define luaL_testudata(L, ud, tname)  testudata(L, ud, tname)
+
+static void *testudata (lua_State *L, int ud, const char *tname) {
+  void *p = lua_touserdata(L, ud);
+  if (p != NULL) {  /* value is a userdata? */
+    if (lua_getmetatable(L, ud)) {  /* does it have a metatable? */
+      luaL_getmetatable(L, tname);  /* get correct metatable */
+      if (!lua_rawequal(L, -1, -2))  /* not the same? */
+        p = NULL;  /* value is a userdata with wrong metatable */
+      lua_pop(L, 2);  /* remove both metatables */
+      return p;
+    }
+  }
+  return NULL;  /* value is not a userdata with a metatable */
+}
+
+#endif
+
 /*--------------------------- Auxiliary Functions ----------------------------*/
 
 /**
@@ -45,6 +68,11 @@ static p_context checkctx(lua_State *L, int idx)
   return (p_context)luaL_checkudata(L, idx, "SSL:Context");
 }
 
+static p_context testctx(lua_State *L, int idx)
+{
+  return (p_context)luaL_testudata(L, idx, "SSL:Context");
+}
+
 /**
  * Prepare the SSL options flag.
  */
@@ -709,6 +737,12 @@ SSL_CTX* lsec_checkcontext(lua_State *L, int idx)
   return ctx->context;
 }
 
+SSL_CTX* lsec_testcontext(lua_State *L, int idx)
+{
+  p_context ctx = testctx(L, idx);
+  return (ctx) ? ctx->context : NULL;
+}
+
 /**
  * Retrieve the mode from the context in the Lua stack.
  */
diff --git a/src/context.h b/src/context.h
index 13fc664..07cc575 100644
--- a/src/context.h
+++ b/src/context.h
@@ -29,6 +29,7 @@ typedef t_context* p_context;
 
 /* Retrieve the SSL context from the Lua stack */
 SSL_CTX *lsec_checkcontext(lua_State *L, int idx);
+SSL_CTX *lsec_testcontext(lua_State *L, int idx);
 
 /* Retrieve the mode from the context in the Lua stack */
 int lsec_getmode(lua_State *L, int idx);