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-rw-r--r--src/libstore/derivations.cc2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/libstore/derivations.cc b/src/libstore/derivations.cc
index 74b861281ee0..1e187ec5e954 100644
--- a/src/libstore/derivations.cc
+++ b/src/libstore/derivations.cc
@@ -342,7 +342,7 @@ Hash hashDerivationModulo(Store & store, Derivation drv)
         Hash h = drvHashes[i.first];
         if (!h) {
             assert(store.isValidPath(i.first));
-            Derivation drv2 = readDerivation(i.first);
+            Derivation drv2 = readDerivation(store.toRealPath(i.first));
             h = hashDerivationModulo(store, drv2);
             drvHashes[i.first] = h;
         }