diff --git a/src/libfetchers/git.cc b/src/libfetchers/git.cc
index b9a240b13..d8e0dbe0a 100644
--- a/src/libfetchers/git.cc
+++ b/src/libfetchers/git.cc
@@ -6,6 +6,7 @@
 #include "url-parts.hh"
 
 #include <sys/time.h>
+#include <sys/wait.h>
 
 using namespace std::string_literals;
 
diff --git a/src/libstore/build/derivation-goal.cc b/src/libstore/build/derivation-goal.cc
index 3ce538f77..55ced2215 100644
--- a/src/libstore/build/derivation-goal.cc
+++ b/src/libstore/build/derivation-goal.cc
@@ -20,6 +20,7 @@
 #include <sys/types.h>
 #include <sys/socket.h>
 #include <sys/un.h>
+#include <sys/wait.h>
 #include <netdb.h>
 #include <fcntl.h>
 #include <termios.h>