diff --git a/src/common/file_util.h b/src/common/file_util.h
index f62ab6cfd..3e7faa43b 100644
--- a/src/common/file_util.h
+++ b/src/common/file_util.h
@@ -174,7 +174,7 @@ public:
     bool Close();
 
     template <typename T>
-    size_t ReadArray(T* data, size_t length) const {
+    size_t ReadArray(T* data, size_t length) {
         static_assert(std::is_trivially_copyable_v<T>,
                       "Given array does not consist of trivially copyable objects");
 
@@ -208,7 +208,7 @@ public:
     }
 
     template <typename T>
-    size_t ReadBytes(T* data, size_t length) const {
+    size_t ReadBytes(T* data, size_t length) {
         static_assert(std::is_trivially_copyable_v<T>, "T must be trivially copyable");
         return ReadArray(reinterpret_cast<char*>(data), length);
     }