1 files changed, 1 insertions, 1 deletions

diff --git a/drivers/w1/slaves/w1_therm.c b/drivers/w1/slaves/w1_therm.c
index 2c8dff9f77da..1ed3d554e372 100644
--- a/drivers/w1/slaves/w1_therm.c
+++ b/drivers/w1/slaves/w1_therm.c
@@ -115,7 +115,7 @@ static struct w1_therm_family_converter w1_therm_families[] = {
 
 static inline int w1_DS18B20_convert_temp(u8 rom[9])
 {
-        s16 t = (rom[1] << 8) | rom[0];
+        int t = ((s16)rom[1] << 8) | rom[0];
         t = t*1000/16;
         return t;
 }