diff --git a/spsa.py b/spsa.py
index 804a51a..e7c176c 100644
--- a/spsa.py
+++ b/spsa.py
@@ -30,7 +30,7 @@ def get_change(self) -> str:
         if self.value > self.start_val:
             return f"+{self.value - self.start_val:.2f}"
         elif self.value < self.start_val:
-            return f"-{self.start_val - self.start_val:2f}"
+            return f"-{self.start_val - self.value:2f}"
         else:
             return f"+-0"