diff --git a/opal/include/opal/sys/sparc/atomic.h b/opal/include/opal/sys/sparc/atomic.h
index d119e48d8e..76350136c1 100644
--- a/opal/include/opal/sys/sparc/atomic.h
+++ b/opal/include/opal/sys/sparc/atomic.h
@@ -107,7 +107,7 @@ static inline int opal_atomic_trylock(opal_atomic_lock_t *lock)
        lock is now held. */
     __asm__ __volatile__ ("\t"
                           "ldstub [%1], %0"
-                          : "=r"(result)
+                          : "+r"(result)
                           : "r"(&(lock->u.sparc_lock))
                           : "memory");
     return (result == 0);
diff --git a/opal/include/opal/sys/sparcv9/atomic.h b/opal/include/opal/sys/sparcv9/atomic.h
index 451015c58b..0001d6b536 100644
--- a/opal/include/opal/sys/sparcv9/atomic.h
+++ b/opal/include/opal/sys/sparcv9/atomic.h
@@ -159,7 +159,7 @@ static inline int opal_atomic_cmpset_64( volatile int64_t *addr,
                        "ldx %2, %%g2               \n\t" /* g2 = oldval */
                        "casxa [%1] " ASI_P ", %%g2, %%g1 \n\t"
                        "stx %%g1, %0               \n"
-                       : "=m"(ret)
+                       : "+m"(ret)
                        : "r"(addr), "m"(oldval)
                        : "%g1", "%g2"
                        );