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-rw-r--r--src/libexpr/primops.cc1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/libexpr/primops.cc b/src/libexpr/primops.cc
index f8ce90ac1..3cc2659fb 100644
--- a/src/libexpr/primops.cc
+++ b/src/libexpr/primops.cc
@@ -25,6 +25,7 @@
#include <algorithm>
#include <cstring>
+#include <sstream>
#include <regex>
#include <dlfcn.h>