diff --git a/src/fish_tests.cpp b/src/fish_tests.cpp
index a1557519e..b676c1f58 100644
--- a/src/fish_tests.cpp
+++ b/src/fish_tests.cpp
@@ -1780,7 +1780,7 @@ class test_lru_t : public lru_cache_t<test_lru_t, int> {
 
     std::vector<value_type> values() const {
         std::vector<value_type> result;
-        for (const auto &p : *this) {
+        for (auto p : *this) {
             result.push_back(p);
         }
         return result;
@@ -1788,7 +1788,7 @@ class test_lru_t : public lru_cache_t<test_lru_t, int> {
 
     std::vector<int> ints() const {
         std::vector<int> result;
-        for (const auto &p : *this) {
+        for (auto p : *this) {
             result.push_back(p.second);
         }
         return result;
diff --git a/src/lru.h b/src/lru.h
index 1ed1412bb..4d930be87 100644
--- a/src/lru.h
+++ b/src/lru.h
@@ -318,7 +318,7 @@ class lru_cache_t {
 
         // Count iterators
         size_t iter_dist = 0;
-        for (const auto &p : *this) {
+        for (auto p : *this) {
             UNUSED(p);
             iter_dist++;
         }