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-rw-r--r--src/nix-store/dotgraph.cc2
1 files changed, 2 insertions, 0 deletions
diff --git a/src/nix-store/dotgraph.cc b/src/nix-store/dotgraph.cc
index 1d8ebfbd0351..053358e3ad85 100644
--- a/src/nix-store/dotgraph.cc
+++ b/src/nix-store/dotgraph.cc
@@ -1,3 +1,5 @@
+#include <iostream>
+
 #include "dotgraph.hh"
 #include "build.hh"