diff --git a/pkgs/development/go-modules/generic/default.nix b/pkgs/development/go-modules/generic/default.nix
index 55fda78b03e..9adebe51247 100644
--- a/pkgs/development/go-modules/generic/default.nix
+++ b/pkgs/development/go-modules/generic/default.nix
@@ -73,6 +73,8 @@ let
     installPhase = args.modInstallPhase or ''
       runHook preInstall
 
+      # remove cached lookup results and tiles
+      rm -rf "''${GOPATH}/pkg/mod/cache/download/sumdb"
       cp -r "''${GOPATH}/pkg/mod/cache/download" $out
 
       runHook postInstall