diff --git a/src/include/port/sco.h b/src/include/port/sco.h
index 1e08b5b8a5c..438e5b2001f 100644
--- a/src/include/port/sco.h
+++ b/src/include/port/sco.h
@@ -1,9 +1,3 @@
-#ifndef NOFILE
-#define NOFILE			NOFILES_MIN
-#endif
-
-#define DISABLE_COMPLEX_MACRO
-
 /* see src/backend/libpq/pqcomm.c */
 #define SCO_ACCEPT_BUG
 
diff --git a/src/include/port/univel.h b/src/include/port/univel.h
index 09bd50c5d8a..071ac1f1ad2 100644
--- a/src/include/port/univel.h
+++ b/src/include/port/univel.h
@@ -9,8 +9,6 @@
 
 typedef unsigned char slock_t;
 
-#define DISABLE_COMPLEX_MACRO
-
 #ifndef			BIG_ENDIAN
 #define			BIG_ENDIAN		4321
 #endif
diff --git a/src/include/port/unixware.h b/src/include/port/unixware.h
index 7a622c83a99..789f1e1b72d 100644
--- a/src/include/port/unixware.h
+++ b/src/include/port/unixware.h
@@ -12,8 +12,6 @@
 
 typedef unsigned char slock_t;
 
-#define DISABLE_COMPLEX_MACRO
-
 #ifndef			BIG_ENDIAN
 #define			BIG_ENDIAN		4321
 #endif