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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 00b38dd98d74..8c4412f11a8b 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);