diff --git a/easyflash/src/ef_env.c b/easyflash/src/ef_env.c
index ce78d2f..8877895 100644
--- a/easyflash/src/ef_env.c
+++ b/easyflash/src/ef_env.c
@@ -713,6 +713,10 @@ static bool find_env_cb(env_node_obj_t env, void *arg1, void *arg2)
     bool *find_ok = arg2;
     uint8_t max_len = strlen(key);
 
+    if (max_len != env->name_len) {
+        return false;
+    }
+
     if (max_len < env->name_len) {
         max_len = env->name_len;
     }