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-rw-r--r--src/libutil/json.hh1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/libutil/json.hh b/src/libutil/json.hh
index 852000a51b38..aec456845056 100644
--- a/src/libutil/json.hh
+++ b/src/libutil/json.hh
@@ -9,6 +9,7 @@ namespace nix {
 void toJSON(std::ostream & str, const char * start, const char * end);
 void toJSON(std::ostream & str, const std::string & s);
 void toJSON(std::ostream & str, const char * s);
+void toJSON(std::ostream & str, unsigned long long n);
 void toJSON(std::ostream & str, unsigned long n);
 void toJSON(std::ostream & str, long n);
 void toJSON(std::ostream & str, double f);