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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 70560302e..09a653002 100644
--- a/src/libexpr/primops.cc
+++ b/src/libexpr/primops.cc
@@ -989,7 +989,7 @@ static void prim_unsafeDiscardOutputDependency(EvalState & state, Value * * args
PathSet context2;
foreach (PathSet::iterator, i, context) {
Path p = *i;
- p = "~" + string(p, 1);
+ if (p.at(0) == '=') p = "~" + string(p, 1);
context2.insert(p);
}