diff --git a/src/port/pread.c b/src/port/pread.c
index 486f07a7dff..a35d3f4b07c 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 eb153ca5028..d83dab6718f 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 282b27115e5..e3a132aa7aa 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 2e8ef7e3785..082bed9abfc 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>