diff --git a/cde/config/cf/linux.cf b/cde/config/cf/linux.cf
index f55779e14..276071bcd 100644
--- a/cde/config/cf/linux.cf
+++ b/cde/config/cf/linux.cf
@@ -168,16 +168,15 @@ TIRPCLIB =
 # endif
 
 #else
-# define LinuxSourceDefines	-D_POSIX_C_SOURCE=199309L \
-				-D_POSIX_SOURCE \
-				-D_BSD_SOURCE -D_SVID_SOURCE -D_XOPEN_SOURCE \
+# define LinuxSourceDefines	-D_POSIX_SOURCE \
+				-D_BSD_SOURCE -D_SVID_SOURCE \
 				-D__NO_STRING_INLINES -D__NO_MATH_INLINES \
 				LinuxLocaleDefines
 # define HasPosixThreads	YES
 # define ThreadedX		YES
 # define HasThreadSafeAPI	YES
 # define ThreadsLibraries	-lpthread
-# define SystemMTDefines		-D_REENTRANT
+# define SystemMTDefines	-D_REENTRANT
 # ifndef HasLibCrypt
 #  define HasLibCrypt		YES
 # endif