diff --git a/src/db/main-db.cpp b/src/db/main-db.cpp
index 08a768615..e048cb6c2 100644
--- a/src/db/main-db.cpp
+++ b/src/db/main-db.cpp
@@ -122,14 +122,14 @@ public:
 private:
 	// Exec function with no return type.
 	template<typename T>
-	constexpr typename std::enable_if<std::is_same<T, void>::value, bool>::type exec () const {
+	typename std::enable_if<std::is_same<T, void>::value, bool>::type exec () const {
 		mFunction();
 		return true;
 	}
 
 	// Exec function with return type.
 	template<typename T>
-	constexpr typename std::enable_if<!std::is_same<T, void>::value, T>::type exec () const {
+	typename std::enable_if<!std::is_same<T, void>::value, T>::type exec () const {
 		return mFunction();
 	}