diff --git a/adafruit_bmp280.py b/adafruit_bmp280.py
index 6ab9b1b..2af58b9 100644
--- a/adafruit_bmp280.py
+++ b/adafruit_bmp280.py
@@ -369,6 +369,11 @@ def altitude(self) -> float:
         p = self.pressure  # in Si units for hPascal
         return 44330 * (1.0 - math.pow(p / self.sea_level_pressure, 0.1903))
 
+    @altitude.setter
+    def altitude(self, value: float) -> None:
+        p = self.pressure  # in Si units for hPascal
+        self.sea_level_pressure = p / math.pow(1.0 - value / 44330.0, 5.255)
+
     ####################### Internal helpers ################################
     def _read_coefficients(self) -> None:
         """Read & save the calibration coefficients"""