diff --git a/lib/isc/powerpc/include/isc/atomic.h b/lib/isc/powerpc/include/isc/atomic.h
index f1638164dd..cec5d9cc65 100644
--- a/lib/isc/powerpc/include/isc/atomic.h
+++ b/lib/isc/powerpc/include/isc/atomic.h
@@ -14,7 +14,7 @@
  * PERFORMANCE OF THIS SOFTWARE.
  */
 
-/* $Id: atomic.h,v 1.10 2011/03/07 23:47:37 tbox Exp $ */
+/* $Id: atomic.h,v 1.11 2011/03/08 00:52:42 marka Exp $ */
 
 #ifndef ISC_ATOMIC_H
 #define ISC_ATOMIC_H 1
@@ -110,7 +110,8 @@ isc_atomic_xadd(isc_int32_t *p, isc_int32_t val) {
 		"mr %0, r6\n"
 		"add r6, r6, %2\n"
 		"stwcx. r6, 0, %1\n"
-		"bne- 1b"
+		"bne- 1b\n"
+		"sync"
 #else
 		"1:"
 		"lwarx 6, 0, %1\n"
@@ -136,7 +137,8 @@ isc_atomic_store(void *p, isc_int32_t val) {
 		"lwarx r6, 0, %0\n"
 		"lwz r6, %1\n"
 		"stwcx. r6, 0, %0\n"
-		"bne- 1b"
+		"bne- 1b\n"
+		"sync"
 #else
 		"1:"
 		"lwarx 6, 0, %0\n"
@@ -165,7 +167,8 @@ isc_atomic_cmpxchg(isc_int32_t *p, isc_int32_t cmpval, isc_int32_t val) {
 		"mr r6, %3\n"
 		"stwcx. r6, 0, %1\n"
 		"bne- 1b\n"
-		"2:"
+		"2:\n"
+		"sync"
 #else
 		"1:"
 		"lwarx 6, 0, %1\n"