diff --git a/aosong/am2315.py b/aosong/am2315.py
index 3ac8a2e..f79f105 100644
--- a/aosong/am2315.py
+++ b/aosong/am2315.py
@@ -133,6 +133,10 @@ def data(self):
         temp_H &=0x7F
 
         tempC = (temp_H*256+temp_L)/10
+
+        if negative:
+            tempC = -abs(tempC)
+
         tempF = self.c_to_f(tempC)
 
         # Verify CRC here
@@ -146,10 +150,6 @@ def data(self):
             self.lastError('CRC error in sensor data.')
             return None
 
-        if negative:
-            tempC = -abs(tempC)
-            tempF = -abs(tempF)
-
         return (humidity, tempC, tempF)