diff --git a/src/libexpr/primops/fetchGit.cc b/src/libexpr/primops/fetchGit.cc
index 90f600284..d866647f0 100644
--- a/src/libexpr/primops/fetchGit.cc
+++ b/src/libexpr/primops/fetchGit.cc
@@ -6,6 +6,7 @@
 #include "hash.hh"
 
 #include <sys/time.h>
+#include <sys/wait.h>
 
 #include <regex>