diff --git a/src/util-lua-flowintlib.c b/src/util-lua-flowintlib.c
index 101ae43d5a..8fb7610bc8 100644
--- a/src/util-lua-flowintlib.c
+++ b/src/util-lua-flowintlib.c
@@ -56,6 +56,9 @@ static int LuaFlowintRegister(lua_State *L)
     if (*flowvar_id == 0) {
         return luaL_error(L, "failed to register flowvar");
     }
+    if (ld->flowints >= DETECT_LUA_MAX_FLOWINTS) {
+        return luaL_error(L, "too many flowints registered");
+    }
     ld->flowint[ld->flowints++] = *flowvar_id;
 
     luaL_getmetatable(L, suricata_flowint_mt);
diff --git a/src/util-lua-flowvarlib.c b/src/util-lua-flowvarlib.c
index 19d15fc9c0..4ad74b4f10 100644
--- a/src/util-lua-flowvarlib.c
+++ b/src/util-lua-flowvarlib.c
@@ -56,6 +56,9 @@ static int LuaFlowvarRegister(lua_State *L)
     if (*flowvar_id == 0) {
         return luaL_error(L, "failed to register flowvar");
     }
+    if (ld->flowvars >= DETECT_LUA_MAX_FLOWVARS) {
+        return luaL_error(L, "too many flowvars registered");
+    }
     ld->flowvar[ld->flowvars++] = *flowvar_id;
 
     luaL_getmetatable(L, suricata_flowvar_mt);