diff --git a/Core/Src/soc_estimation.c b/Core/Src/soc_estimation.c
index 8143ddd..271e6e3 100644
--- a/Core/Src/soc_estimation.c
+++ b/Core/Src/soc_estimation.c
@@ -53,7 +53,7 @@ void soc_update() {
     // Otherwise, use the current counter to update SoC
     float as_delta = shunt_data.current_counter - mAs_before_current;
     float soc_delta = as_delta / SOC_ESTIMATION_BATTERY_CAPACITY * 100;
-    current_soc = soc_before_current + soc_delta;
+    current_soc = soc_before_current - soc_delta;
   }
 }