diff --git a/var/spack/repos/builtin/packages/tcsh/package.py b/var/spack/repos/builtin/packages/tcsh/package.py
index 2b8a1d9a6c8..24215b5d9ff 100644
--- a/var/spack/repos/builtin/packages/tcsh/package.py
+++ b/var/spack/repos/builtin/packages/tcsh/package.py
@@ -108,6 +108,7 @@ class Tcsh(AutotoolsPackage):
     )
 
     depends_on("ncurses+termlib")
+    depends_on("libxcrypt", when="platform=linux")
 
     @run_after("install")
     def link_csh(self):