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-rw-r--r--src/libexpr/expr-to-xml.hh3
1 files changed, 2 insertions, 1 deletions
diff --git a/src/libexpr/expr-to-xml.hh b/src/libexpr/expr-to-xml.hh
index 6b95c88f5909..eb628660d937 100644
--- a/src/libexpr/expr-to-xml.hh
+++ b/src/libexpr/expr-to-xml.hh
@@ -5,10 +5,11 @@
 #include <map>
 
 #include "nixexpr.hh"
+#include "aterm.hh"
 
 namespace nix {
 
-void printTermAsXML(Expr e, std::ostream & out);
+void printTermAsXML(Expr e, std::ostream & out, ATermList & context);
     
 }