diff --git a/src/lib/libast/comp/conf.tab b/src/lib/libast/comp/conf.tab
index e65e87659..8c68faaa7 100644
--- a/src/lib/libast/comp/conf.tab
+++ b/src/lib/libast/comp/conf.tab
@@ -441,7 +441,6 @@ PRIO_IO				POSIX	PC 1 FUW
 PROC_RSRC_MGR			C	QQ 1 L
 PTHREAD_DESTRUCTOR_ITERATIONS	C	QQ 1 L
 PTHREAD_KEYS_MAX		C	QQ 1 L
-PTHREAD_STACK_MIN		C	QQ 1 L
 PTHREAD_THREADS_MAX		C	QQ 1 L
 PTRDIFF_MAX			C	XX 1 LMU	stdint.h 65535
 PTRDIFF_MIN			C	XX 1 LMU	stdint.h -65535
@@ -556,7 +555,6 @@ THREAD_PRIO_PROTECT		POSIX	SC 1 CDFUW
 THREAD_PROCESS_SHARED		POSIX	SC 1 CDFUW
 THREAD_SAFE_FUNCTIONS		POSIX	SC 1 CDFUW
 THREAD_SPORADIC_SERVER		POSIX	SC 1 FUW
-THREAD_STACK_MIN		POSIX	SC 1 LUW	PTHREAD_STACK_MIN
 THREAD_THREADS_MAX		POSIX	SC 1 LMUW	PTHREAD_THREADS_MAX 64
 TIMEOUTS			POSIX	SC 1 FUW
 TIMERS				POSIX	SC 1 CDFUW