diff --git a/include/bmp.h b/include/bmp.h
index 5c4f5c4..164d187 100644
--- a/include/bmp.h
+++ b/include/bmp.h
@@ -10,7 +10,9 @@ namespace Bmp {
         float pressure;
         float altitude;
         float readTemp() {
-            temp = bmp.readTemperature() - 2;
+            char buf[10];
+            sprintf(buf, "%.1f", bmp.readTemperature() - 2);
+            temp = atof(buf);
             return temp;
         }
         void readAll() {