diff --git a/src/libstore/local-store.cc b/src/libstore/local-store.cc
index 6193792118..f1a314fa10 100644
--- a/src/libstore/local-store.cc
+++ b/src/libstore/local-store.cc
@@ -16,6 +16,7 @@
 #include <utime.h>
 #include <fcntl.h>
 #include <errno.h>
+#include <stdio.h>
 
 
 namespace nix {
diff --git a/src/libstore/optimise-store.cc b/src/libstore/optimise-store.cc
index 2246fa8269..d15049201e 100644
--- a/src/libstore/optimise-store.cc
+++ b/src/libstore/optimise-store.cc
@@ -5,6 +5,7 @@
 #include <sys/stat.h>
 #include <unistd.h>
 #include <errno.h>
+#include <stdio.h>
 
 
 namespace nix {