diff --git a/src/GS450H.cpp b/src/GS450H.cpp
index a4a4924..3aa91fd 100644
--- a/src/GS450H.cpp
+++ b/src/GS450H.cpp
@@ -443,8 +443,8 @@ void GS450HClass::Task1Ms()
             dma_clear_interrupt_flags(DMA1, DMA_CHANNEL6, DMA_TCIF);
             statusInv=1;
             dc_bus_voltage=(((mth_data[82]|mth_data[83]<<8)-5)/2);
-            temp_inv_water=(mth_data[42]|mth_data[43]<<8);
-            temp_inv_inductor=(mth_data[86]|mth_data[87]<<8);
+            temp_inv_water=int8_t(mth_data[42]);
+            temp_inv_inductor=int8_t(mth_data[86]);
             mg1_speed=mth_data[6]|mth_data[7]<<8;
             mg2_speed=mth_data[31]|mth_data[32]<<8;
         }