diff --git a/src/cmd/ksh93/include/jobs.h b/src/cmd/ksh93/include/jobs.h
index af5ea5cd1..84d48dae7 100644
--- a/src/cmd/ksh93/include/jobs.h
+++ b/src/cmd/ksh93/include/jobs.h
@@ -149,32 +149,6 @@ extern struct jobs job;
 #define vmbusy()	0
 #endif
 
-/*
- * Job locking and unlocking macros
- */
-#if defined(__sync_fetch_and_add) && defined(__sync_fetch_and_sub)
-/*
- * This version may prevent segfaults due to a GCC optimizer bug.
- * See: https://bugzilla.redhat.com/show_bug.cgi?id=1112306
- *	https://bugs.launchpad.net/ubuntu/+source/ksh/+bug/1697501
- */
-#define asoincint(p)  __sync_fetch_and_add(p,1)
-#define asodecint(p)  __sync_fetch_and_sub(p,1)
-#define job_lock()	asoincint(&job.in_critical)
-#define job_unlock()	\
-	do { \
-		int	sig; \
-		if (asodecint(&job.in_critical)==1 && (sig = job.savesig)) \
-		{ \
-			if (!asoincint(&job.in_critical) && !vmbusy()) \
-				job_reap(sig); \
-			asodecint(&job.in_critical); \
-		} \
-	} while(0)
-#else
-/*
- * Original ksh93 version.
- */
 #define job_lock()	(job.in_critical++)
 #define job_unlock()	\
 	do { \
@@ -186,7 +160,6 @@ extern struct jobs job;
 			job.in_critical--; \
 		} \
 	} while(0)
-#endif /* defined(__sync_fetch_and_add) && defined(__sync_fetch_and_sub) */
 
 extern const char	e_jobusage[];
 extern const char	e_done[];