diff --git a/include/arch/x86/atomic.h b/include/arch/x86/atomic.h
index fee6c1a6..2437a860 100644
--- a/include/arch/x86/atomic.h
+++ b/include/arch/x86/atomic.h
@@ -59,7 +59,7 @@ static inline bool atomic_test_bit(unsigned int bit, volatile void *addr) {
 static inline bool atomic_test_and_set_bit(unsigned int bit, volatile void *addr) {
     bool status;
 
-    asm volatile("lock bts %[bit], %[addr];"
+    asm volatile("lock btsl %[bit], %[addr];"
                  "setc %[status];"
                  : [ status ] "=r"(status)
                  : [ bit ] "Ir"(bit), [ addr ] "m"(*(uint8_t *) addr)
@@ -71,7 +71,7 @@ static inline bool atomic_test_and_set_bit(unsigned int bit, volatile void *addr
 static inline bool atomic_test_and_reset_bit(unsigned int bit, volatile void *addr) {
     bool status;
 
-    asm volatile("lock btr %[bit], %[addr];"
+    asm volatile("lock btrl %[bit], %[addr];"
                  "setc %[status];"
                  : [ status ] "=r"(status)
                  : [ bit ] "Ir"(bit), [ addr ] "m"(*(uint8_t *) addr)