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-rw-r--r--src/libexpr/primops.cc2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/libexpr/primops.cc b/src/libexpr/primops.cc
index c5579679caf3..b28201593335 100644
--- a/src/libexpr/primops.cc
+++ b/src/libexpr/primops.cc
@@ -262,7 +262,7 @@ static Hash hashDerivationModulo(EvalState & state, Derivation drv)
     }
     drv.inputDrvs = inputs2;
     
-    return hashTerm(unparseDerivation(drv));
+    return hashString(htSHA256, unparseDerivation(drv));
 }