diff --git a/nixos/modules/monitoring/server/prometheus.nix b/nixos/modules/monitoring/server/prometheus.nix
index 316cea8904f0a1092e26290c4dd7352f77ce7431..da61228951df02b6bef0cdc3e3e108da73122f15 100644
--- a/nixos/modules/monitoring/server/prometheus.nix
+++ b/nixos/modules/monitoring/server/prometheus.nix
@@ -33,7 +33,7 @@ in {
     };
     blackboxExporterHttpsTargets = lib.mkOption {
       type = with lib.types; listOf str;
-      example = lib.literalExample "[ 'https://node1.com/' 'https://node2.org/' ]";
+      example = lib.literalExample "[ \"https://node1.com/\" \"https://node2.org/\" ]";
       description = "List of https URLs to scrape.";
     };
   };