diff --git a/src/testdir/test_crypt.vim b/src/testdir/test_crypt.vim
index 8f1041449c60c4..9eb99d93adda50 100644
--- a/src/testdir/test_crypt.vim
+++ b/src/testdir/test_crypt.vim
@@ -178,6 +178,7 @@ endfunc
 
 func Test_uncrypt_xchacha20v2_custom()
   CheckFeature sodium
+  CheckArch s390x
   " Test, reading xchacha20v2 with custom encryption parameters
   let hex =<< trim END
   00000000: 5669 6d43 7279 7074 7e30 3521 934b f288  VimCrypt~05!.K..
@@ -262,6 +263,7 @@ endfunc
 
 func Test_uncrypt_xchacha20v2_2()
   CheckFeature sodium
+  CheckArch s390x
 
   sp Xcrypt_sodium_v2.txt
   " Create a larger file, so that Vim will write in several blocks