diff --git a/src/libstore/build.cc b/src/libstore/build.cc
index 2d81f72c1..50c59c131 100644
--- a/src/libstore/build.cc
+++ b/src/libstore/build.cc
@@ -20,6 +20,7 @@
 #include <sys/types.h>
 #include <sys/stat.h>
 #include <sys/utsname.h>
+#include <sys/select.h>
 #include <fcntl.h>
 #include <unistd.h>
 #include <errno.h>
diff --git a/src/libstore/local-store.cc b/src/libstore/local-store.cc
index 91149b30f..1dcd7228f 100644
--- a/src/libstore/local-store.cc
+++ b/src/libstore/local-store.cc
@@ -13,6 +13,7 @@
 
 #include <sys/types.h>
 #include <sys/stat.h>
+#include <sys/select.h>
 #include <sys/time.h>
 #include <unistd.h>
 #include <utime.h>