diff --git a/nix/pkgs/prometheus-snmp-config/default.nix b/nix/pkgs/prometheus-snmp-config/default.nix
index c6865265c8..d1fd6e95d6 100644
--- a/nix/pkgs/prometheus-snmp-config/default.nix
+++ b/nix/pkgs/prometheus-snmp-config/default.nix
@@ -24,7 +24,7 @@ let
     version = "lukegb-${prometheus-snmp-exporter.version}";
 
     outputHashMode = "recursive";
-    outputHash = "1xh6lqscyl08qrjw4xzwjb41nfngks7bjsdylidx57daydm5xigz";
+    outputHash = "sha256:1xh6lqscyl08qrjw4xzwjb41nfngks7bjsdylidx57daydm5xigz";
 
     buildInputs = [
       curl