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-rw-r--r--src/fix-ng/primops.cc2
1 files changed, 2 insertions, 0 deletions
diff --git a/src/fix-ng/primops.cc b/src/fix-ng/primops.cc
index df5747edd48b..fb923ed46e5c 100644
--- a/src/fix-ng/primops.cc
+++ b/src/fix-ng/primops.cc
@@ -114,6 +114,8 @@ static string processBinding(EvalState & state, Expr e, NixExpr & ne)
         }
 	return s;
     }
+
+    if (ATmatch(e, "Null")) return "";
     
     throw badTerm("invalid derivation binding", e);
 }