diff --git a/py/misc.h b/py/misc.h
index 5ac0f93..cebbd38 100644
--- a/py/misc.h
+++ b/py/misc.h
@@ -23,8 +23,8 @@
  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  * THE SOFTWARE.
  */
-#ifndef __MICROPY_INCLUDED_PY_MISC_H__
-#define __MICROPY_INCLUDED_PY_MISC_H__
+#ifndef MICROPY_INCLUDED_PY_MISC_H
+#define MICROPY_INCLUDED_PY_MISC_H
 
 // a mini library of useful types and functions
 
@@ -223,4 +223,4 @@
 #define MP_FLOAT_EXP_BIAS ((1 << (MP_FLOAT_EXP_BITS - 1)) - 1)
 #endif // MICROPY_PY_BUILTINS_FLOAT
 
-#endif // __MICROPY_INCLUDED_PY_MISC_H__
+#endif // MICROPY_INCLUDED_PY_MISC_H