diff --git a/nixos/modules/services/networking/hostapd.nix b/nixos/modules/services/networking/hostapd.nix
index 924abfc2953f..4ec066c2ec97 100644
--- a/nixos/modules/services/networking/hostapd.nix
+++ b/nixos/modules/services/networking/hostapd.nix
@@ -987,7 +987,7 @@ in {
                   } // optionalAttrs (bssCfg.authentication.wpaPassword != null) {
                     wpa_passphrase = bssCfg.authentication.wpaPassword;
                   } // optionalAttrs (bssCfg.authentication.wpaPskFile != null) {
-                    wpa_psk_file = bssCfg.authentication.wpaPskFile;
+                    wpa_psk_file = toString bssCfg.authentication.wpaPskFile;
                   };
 
                   dynamicConfigScripts = let