diff --git a/src/util/GenerateArray.hxx b/src/util/GenerateArray.hxx
index 049653650..b69658421 100644
--- a/src/util/GenerateArray.hxx
+++ b/src/util/GenerateArray.hxx
@@ -39,7 +39,10 @@ _GenerateArray(F &&f, std::index_sequence<I...>) noexcept
 {
 	using T = decltype(f(0));
 
-	return std::array<T, N>{f(I)...};
+	/* double curly braces for compatibility with older compilers
+	   which are not 100% C++17 compliant (e.g. Apple xcode
+	   9.4) */
+	return std::array<T, N>{{f(I)...}};
 }
 
 /**