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-rw-r--r--src/libexpr/value-to-xml.cc2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/libexpr/value-to-xml.cc b/src/libexpr/value-to-xml.cc
index 3cecc33dc299..bbbb7039bf70 100644
--- a/src/libexpr/value-to-xml.cc
+++ b/src/libexpr/value-to-xml.cc
@@ -155,7 +155,7 @@ static void printValueAsXML(EvalState & state, bool strict, bool location,
 
 
 void ExternalValueBase::printValueAsXML(EvalState & state, bool strict,
-    bool location, XMLWriter & doc, PathSet & context, PathSet & drvsSeen)
+    bool location, XMLWriter & doc, PathSet & context, PathSet & drvsSeen) const
 {
     doc.writeEmptyElement("unevaluated");
 }