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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 418956feb30e..0fd958846440 100644
--- a/src/libstore/build.cc
+++ b/src/libstore/build.cc
@@ -1765,7 +1765,7 @@ void DerivationGoal::startBuilder()
 
     /* In a sandbox, for determinism, always use the same temporary
        directory. */
-    tmpDirInSandbox = useChroot ? "/tmp/nix-build-" + drvName + "-0" : tmpDir;
+    tmpDirInSandbox = useChroot ? canonPath("/tmp", true) + "/nix-build-" + drvName + "-0" : tmpDir;
 
     /* Add all bindings specified in the derivation via the
        environments, except those listed in the passAsFile