diff --git a/pkgs/servers/sql/postgresql/ext/system_stats.nix b/pkgs/servers/sql/postgresql/ext/system_stats.nix
index c1700fc0380d..03d3034079a1 100644
--- a/pkgs/servers/sql/postgresql/ext/system_stats.nix
+++ b/pkgs/servers/sql/postgresql/ext/system_stats.nix
@@ -17,6 +17,8 @@ stdenv.mkDerivation rec {
     hash = "sha256-/xXnui0S0ZjRw7P8kMAgttHVv8T41aOhM3pM8P0OTig=";
   };
 
+  buildFlags = [ "PG_CFLAGS=-Wno-error=vla" ];
+
   installPhase = ''
     runHook preInstall