diff --git a/lib/isc/rwlock.c b/lib/isc/rwlock.c
index 98a835e861..a914ba4cee 100644
--- a/lib/isc/rwlock.c
+++ b/lib/isc/rwlock.c
@@ -44,9 +44,11 @@
 #if defined(_MSC_VER)
 # include <intrin.h>
 # define isc_rwlock_pause() YieldProcessor()
-#elif defined(__x86_64__) || defined(__i386__)
+#elif defined(__x86_64__)
 # include <immintrin.h>
 # define isc_rwlock_pause() _mm_pause()
+#elif defined(__i386__)
+# define isc_rwlock_pause() __asm__ __volatile__ ("rep; nop")
 #elif defined(__ia64__)
 # define isc_rwlock_pause() __asm__ __volatile__ ("hint @pause")
 #elif defined(__arm__)