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-rw-r--r--lib/spack/spack/patch.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/lib/spack/spack/patch.py b/lib/spack/spack/patch.py
index d38b2ef767..8eb7b8146f 100644
--- a/lib/spack/spack/patch.py
+++ b/lib/spack/spack/patch.py
@@ -291,7 +291,7 @@ def from_dict(dictionary):
if not checker.check(patch.path):
raise fs.ChecksumError(
"sha256 checksum failed for %s" % patch.path,
- "Expected %s but got %s" % (sha256, checker.sum),
+ "Expected %s but got %s " % (sha256, checker.sum) +
"Patch may have changed since concretization.")
return patch
else: