diff --git a/sys/amd64/conf/GENERIC b/sys/amd64/conf/GENERIC
index 3b369b0ebeeb..5c60d0f33e97 100644
--- a/sys/amd64/conf/GENERIC
+++ b/sys/amd64/conf/GENERIC
@@ -48,6 +48,9 @@ options 	KTRACE			#ktrace(1) syscall trace support
 options 	SYSVSHM			#SYSV-style shared memory
 options 	SYSVMSG			#SYSV-style message queues
 options 	SYSVSEM			#SYSV-style semaphores
+options 	P1003_1B		#Posix P1003_1B real-time extentions
+options 	_KPOSIX_PRIORITY_SCHEDULING
+options 	_KPOSIX_VERSION=199309L
 
 # To make an SMP kernel, the next two are needed
 #options 	SMP			# Symmetric MultiProcessor Kernel
diff --git a/sys/i386/conf/GENERIC b/sys/i386/conf/GENERIC
index 3b369b0ebeeb..5c60d0f33e97 100644
--- a/sys/i386/conf/GENERIC
+++ b/sys/i386/conf/GENERIC
@@ -48,6 +48,9 @@ options 	KTRACE			#ktrace(1) syscall trace support
 options 	SYSVSHM			#SYSV-style shared memory
 options 	SYSVMSG			#SYSV-style message queues
 options 	SYSVSEM			#SYSV-style semaphores
+options 	P1003_1B		#Posix P1003_1B real-time extentions
+options 	_KPOSIX_PRIORITY_SCHEDULING
+options 	_KPOSIX_VERSION=199309L
 
 # To make an SMP kernel, the next two are needed
 #options 	SMP			# Symmetric MultiProcessor Kernel