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-rw-r--r--src/libstore/gc.cc2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/libstore/gc.cc b/src/libstore/gc.cc
index 14c8ba0bfe90..c2e999a6e6a7 100644
--- a/src/libstore/gc.cc
+++ b/src/libstore/gc.cc
@@ -196,7 +196,7 @@ void LocalStore::addTempRoot(const Path & path)
     lockFile(fdTempRoots, ltWrite, true);
 
     string s = path + '\0';
-    writeFull(fdTempRoots, (const unsigned char *) s.c_str(), s.size());
+    writeFull(fdTempRoots, (const unsigned char *) s.data(), s.size());
 
     /* Downgrade to a read lock. */
     debug(format("downgrading to read lock on `%1%'") % fnTempRoots);