diff --git a/nixos/modules/services/misc/zoneminder.nix b/nixos/modules/services/misc/zoneminder.nix
index 45b554d193d5..11722979851c 100644
--- a/nixos/modules/services/misc/zoneminder.nix
+++ b/nixos/modules/services/misc/zoneminder.nix
@@ -328,6 +328,14 @@ in {
 
           ${zoneminder}/bin/zmupdate.pl -nointeractive
           ${zoneminder}/bin/zmupdate.pl --nointeractive -f
+
+          # Update ZM's Nix store path in the configuration table. Do nothing if the config doesn't
+          # contain ZM's Nix store path.
+          ${config.services.mysql.package}/bin/mysql -u zoneminder zm << EOF
+            UPDATE Config
+              SET Value = REGEXP_REPLACE(Value, "^/nix/store/[^-/]+-zoneminder-[^/]+", "${pkgs.zoneminder}")
+              WHERE Name = "ZM_FONT_FILE_LOCATION";
+          EOF
         '';
         serviceConfig = {
           User = user;