diff --git a/src/em/Parser.cpp b/src/em/Parser.cpp
index 2bd1a46..df45c30 100644
--- a/src/em/Parser.cpp
+++ b/src/em/Parser.cpp
@@ -1,5 +1,6 @@
 #include "Parser.h"
 
+#include <algorithm>
 #include <unordered_set>
 
 #include "ast/Program.h"
diff --git a/src/em/values/sets/MaterialSetValue.h b/src/em/values/sets/MaterialSetValue.h
index b50d0f1..39c52e5 100644
--- a/src/em/values/sets/MaterialSetValue.h
+++ b/src/em/values/sets/MaterialSetValue.h
@@ -8,11 +8,11 @@
 
 namespace em::values::sets {
   struct ValuePtrHash {
-    constexpr std::size_t operator()(const std::shared_ptr<Value>& value) const { return value->hash(); }
+    std::size_t operator()(const std::shared_ptr<Value>& value) const { return value->hash(); }
   };
 
   struct ValuePtrEq {
-    constexpr bool operator()(const std::shared_ptr<Value>& a, const std::shared_ptr<Value>& b) const {
+    bool operator()(const std::shared_ptr<Value>& a, const std::shared_ptr<Value>& b) const {
       return *a == *b;
     }
   };
@@ -42,4 +42,4 @@ namespace em::values::sets {
    private:
     ValuesSet mValues{};
   };
-}  // namespace em::values::sets
\ No newline at end of file
+}  // namespace em::values::sets