diff --git a/src/port/pread.c b/src/port/pread.c
index 491605926f2..bbf12ee0279 100644
--- a/src/port/pread.c
+++ b/src/port/pread.c
@@ -15,7 +15,7 @@
  */
 
 
-#include "postgres.h"
+#include "c.h"
 
 #ifdef WIN32
 #include <windows.h>
diff --git a/src/port/preadv.c b/src/port/preadv.c
index d12e5a122bb..dcc7fe0db40 100644
--- a/src/port/preadv.c
+++ b/src/port/preadv.c
@@ -15,7 +15,7 @@
  */
 
 
-#include "postgres.h"
+#include "c.h"
 
 #ifdef WIN32
 #include <windows.h>
diff --git a/src/port/pwrite.c b/src/port/pwrite.c
index eeaffacc48a..cadecc481c2 100644
--- a/src/port/pwrite.c
+++ b/src/port/pwrite.c
@@ -15,7 +15,7 @@
  */
 
 
-#include "postgres.h"
+#include "c.h"
 
 #ifdef WIN32
 #include <windows.h>
diff --git a/src/port/pwritev.c b/src/port/pwritev.c
index 0bdd69fffc4..bc53704ef79 100644
--- a/src/port/pwritev.c
+++ b/src/port/pwritev.c
@@ -15,7 +15,7 @@
  */
 
 
-#include "postgres.h"
+#include "c.h"
 
 #ifdef WIN32
 #include <windows.h>