diff --git a/lib/spack/spack/spec.py b/lib/spack/spack/spec.py
index fc65dcb64b8eaf..e5b9cad4312764 100644
--- a/lib/spack/spack/spec.py
+++ b/lib/spack/spack/spec.py
@@ -4042,7 +4042,7 @@ def format_path(
 
     def __str__(self):
         if self._concrete:
-            return self.format("{name}{@version}{/hash:7}")
+            return self.format("{name}{@version}{/hash}")
 
         if not self._dependencies:
             return self.format()