diff --git a/src/libstore/globals.cc b/src/libstore/globals.cc
index bee94cbd8..fa8799314 100644
--- a/src/libstore/globals.cc
+++ b/src/libstore/globals.cc
@@ -8,7 +8,7 @@
 #include <thread>
 #include <dlfcn.h>
 #include <sys/utsname.h>
-
+#include <unordered_set>
 
 namespace nix {