diff --git a/pkgs/development/libraries/glib-networking/default.nix b/pkgs/development/libraries/glib-networking/default.nix
index 828a00ecda64..39e17a894cb7 100644
--- a/pkgs/development/libraries/glib-networking/default.nix
+++ b/pkgs/development/libraries/glib-networking/default.nix
@@ -35,6 +35,12 @@ stdenv.mkDerivation rec {
     })
 
     ./installed-tests-path.patch
+
+    # pkcs11 tests provide a relative path that gnutls of course isn't able to
+    # load, resulting in test failures
+    # https://gitlab.gnome.org/GNOME/glib-networking/-/blob/2.78.1/tls/tests/certificate.c#L926
+    # https://gitlab.gnome.org/GNOME/glib-networking/-/blob/2.78.1/tls/tests/connection.c#L3380
+    ./disable-pkcs11-tests.patch
   ];
 
   strictDeps = true;
diff --git a/pkgs/development/libraries/glib-networking/disable-pkcs11-tests.patch b/pkgs/development/libraries/glib-networking/disable-pkcs11-tests.patch
new file mode 100644
index 000000000000..43a37878b56c
--- /dev/null
+++ b/pkgs/development/libraries/glib-networking/disable-pkcs11-tests.patch
@@ -0,0 +1,13 @@
+diff --git a/meson.build b/meson.build
+index 0b3b8c0..7f6ce09 100644
+--- a/meson.build
++++ b/meson.build
+@@ -86,7 +86,7 @@ if gnutls_dep.found()
+   backends += ['gnutls']
+   # test-specific, maybe move to tls/tests
+   if cc.has_function('gnutls_pkcs11_init', prefix: '#include <gnutls/pkcs11.h>', dependencies: gnutls_dep)
+-    config_h.set10('HAVE_GNUTLS_PKCS11', true)
++    config_h.set10('HAVE_GNUTLS_PKCS11', false)
+   endif
+ endif
+