diff --git a/pkgs/applications/networking/nextcloud-client/default.nix b/pkgs/applications/networking/nextcloud-client/default.nix
index 322f97f48031..820bfa8b4efe 100644
--- a/pkgs/applications/networking/nextcloud-client/default.nix
+++ b/pkgs/applications/networking/nextcloud-client/default.nix
@@ -87,6 +87,9 @@ mkDerivation rec {
     "-DNO_SHIBBOLETH=1" # allows to compile without qtwebkit
   ];
 
+  # causes redefinition of _FORTIFY_SOURCE
+  hardeningDisable = [ "fortify3" ];
+
   postBuild = ''
     make doc-man
   '';