diff --git a/debian/tests/system-test b/debian/tests/system-test
index 16806c0b..5405a33f 100755
--- a/debian/tests/system-test
+++ b/debian/tests/system-test
@@ -22,6 +22,7 @@ disable_test() {
 export USER=root # for t07/RootDirInaccessible
 
 disable_test t02_config/config CreateConfigTest "different conf"
+disable_test t04_mirror/create CreateMirror31Test "public key not found"
 disable_test t04_mirror/create CreateMirror35Test "flaky on s390"
 disable_test t07_serve/serve Serve1Test "minor html diff"
 disable_test t09_repo/edit EditRepo4Test "flaky on riscv64"