StackRduino
diff --git a/‎py/objint.c‎
Lines changed: 6 additions & 1 deletion b/‎py/objint.c‎
Lines changed: 6 additions & 1 deletion
@@ -103,7 +103,12 @@ mp_fp_as_int_class_t mp_classify_fp_as_int(mp_float_t val) {
 #if MICROPY_FLOAT_IMPL == MICROPY_FLOAT_IMPL_DOUBLE
         e |= u.i[MP_ENDIANNESS_BIG] != 0;
 #endif
-        e += ((1 << MP_FLOAT_EXP_BITS) - 1) << MP_FLOAT_EXP_SHIFT_I32;
+        if ((e & ~(1 << MP_FLOAT_SIGN_SHIFT_I32)) == 0) {
+            // handle case of -0 (when sign is set but rest of bits are zero)
+            e = 0;
+        } else {
+            e += ((1 << MP_FLOAT_EXP_BITS) - 1) << MP_FLOAT_EXP_SHIFT_I32;
+        }
     } else {
         e &= ~((1 << MP_FLOAT_EXP_SHIFT_I32) - 1);
     }