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-rw-r--r--src/libexpr/primops.cc9
1 files changed, 8 insertions, 1 deletions
diff --git a/src/libexpr/primops.cc b/src/libexpr/primops.cc
index a752b9a59..d5e1ce7be 100644
--- a/src/libexpr/primops.cc
+++ b/src/libexpr/primops.cc
@@ -974,7 +974,14 @@ static void prim_unsafeDiscardOutputDependency(EvalState & state, Value * * args
PathSet context2;
foreach (PathSet::iterator, i, context) {
Path p = *i;
- if (p.at(0) == '=') p = "~" + string(p, 1);
+ if (p.at(0) == '=')
+ {
+ size_t index;
+ p = "~" + string(p, 1);
+ index = p.find("=");
+ if (index < p.find("/"))
+ p = "~" + string(p, index + 1);
+ }
context2.insert(p);
}