diff --git a/nixos/modules/monitoring/exporters/megacli2prom.nix b/nixos/modules/monitoring/exporters/megacli2prom.nix
index b364088aa148a2faa58a6ac34980120f8d7bf9d0..a38f1ccc18b59073ff835e50babeb565f79a20b8 100644
--- a/nixos/modules/monitoring/exporters/megacli2prom.nix
+++ b/nixos/modules/monitoring/exporters/megacli2prom.nix
@@ -42,7 +42,13 @@ in {
         wantedBy = [ "multi-user.target" ];
         startAt = cfg.interval;
         path = [ pkgs.megacli ];
-        script = "${ourpkgs.megacli2prom}/bin/megacli2prom > ${cfg.outFile}";
+        # Save to a temp file and then move atomically so the
+        # textfile collector won't read a partial file.
+        # See https://github.com/prometheus/node_exporter#textfile-collector
+        script = ''
+          "${ourpkgs.megacli2prom}/bin/megacli2prom" > "${cfg.outFile}.tmp"
+          mv "${cfg.outFile}.tmp" "${cfg.outFile}"
+        '';
       };
   };
 }
diff --git a/nixos/modules/monitoring/exporters/tahoe.nix b/nixos/modules/monitoring/exporters/tahoe.nix
index f63c21e3b0861c9ddeb94a3b4784a8d8a78d9377..9b46adc3b551182d39d03b55a74dccf2b0e565e5 100644
--- a/nixos/modules/monitoring/exporters/tahoe.nix
+++ b/nixos/modules/monitoring/exporters/tahoe.nix
@@ -46,8 +46,8 @@ in {
         startAt = cfg.interval;
         path = [ pkgs.curl ];
 
-        # Curl to a temp file and then move atomically so textfile collector
-        # won't read a partial file.
+        # Save to a temp file and then move atomically so the
+        # textfile collector won't read a partial file.
         # See https://github.com/prometheus/node_exporter#textfile-collector
         script = ''
           curl --silent --show-error --fail-with-body --output "${cfg.outFile}.tmp" "${cfg.scrapeEndpoint}"