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-rw-r--r--src/libexpr/print.cc1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/libexpr/print.cc b/src/libexpr/print.cc
index c56b0e72e..e387a09fb 100644
--- a/src/libexpr/print.cc
+++ b/src/libexpr/print.cc
@@ -1,6 +1,7 @@
#include <limits>
#include <span>
#include <unordered_set>
+#include <sstream>
#include "escape-string.hh"
#include "print.hh"