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-rw-r--r--src/libstore/build.cc2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/libstore/build.cc b/src/libstore/build.cc
index 00b38dd98..8c4412f11 100644
--- a/src/libstore/build.cc
+++ b/src/libstore/build.cc
@@ -547,7 +547,7 @@ void UserLock::acquire()
int err = getgrouplist(pw->pw_name, pw->pw_gid,
supplementaryGIDs.data(), &ngroups);
if (err == -1)
- throw Error(format("failed to get list of supplementary groups for ‘%1’") % pw->pw_name);
+ throw Error(format("failed to get list of supplementary groups for ‘%1%’") % pw->pw_name);
supplementaryGIDs.resize(ngroups);