diff --git a/src/data.c b/src/data.c
index 9b6cbd23..b1acfecc 100644
--- a/src/data.c
+++ b/src/data.c
@@ -14,6 +14,8 @@
 #include "storage/checksum_impl.h"
 #include <common/pg_lzcompress.h>
 
+#include <unistd.h>
+
 #include <sys/stat.h>
 
 #ifdef HAVE_LIBZ
diff --git a/src/parsexlog.c b/src/parsexlog.c
index ed73f70c..86827a85 100644
--- a/src/parsexlog.c
+++ b/src/parsexlog.c
@@ -22,6 +22,7 @@
 #endif
 
 #include "utils/thread.h"
+#include <unistd.h>
 #include <time.h>
 
 /*
diff --git a/src/util.c b/src/util.c
index 94a18a9a..f2820650 100644
--- a/src/util.c
+++ b/src/util.c
@@ -16,6 +16,8 @@
 
 #include <unistd.h>
 
+#include <sys/stat.h>
+
 const char *
 base36enc(long unsigned int value)
 {