diff --git a/scripts/download-from-binary-cache.pl.in b/scripts/download-from-binary-cache.pl.in
index 335d7d970..f16434d0a 100644
--- a/scripts/download-from-binary-cache.pl.in
+++ b/scripts/download-from-binary-cache.pl.in
@@ -40,7 +40,8 @@ sub addRequest {
 
     $curl->setopt(CURLOPT_PRIVATE, $curlId);
     $curl->setopt(CURLOPT_URL, $url);
-    $curl->setopt(CURLOPT_WRITEDATA, \$requests{$curlId}->{content});
+    open (my $fh, ">", \$requests{$curlId}->{content});
+    $curl->setopt(CURLOPT_WRITEDATA, $fh);
     $curl->setopt(CURLOPT_FOLLOWLOCATION, 1);
     $curl->setopt(CURLOPT_CAINFO, $caBundle) if defined $caBundle;
     $curl->setopt(CURLOPT_USERAGENT, "Nix/$Nix::Config::version");