diff --git a/CADETProcess/tools/yamamoto.py b/CADETProcess/tools/yamamoto.py
index e55ba72ca..26b1952cc 100644
--- a/CADETProcess/tools/yamamoto.py
+++ b/CADETProcess/tools/yamamoto.py
@@ -255,7 +255,7 @@ def yamamoto_wrapper(c_s, nu, k_eq):
         return yamamoto_equation(c_s, lambda_, nu, k_eq)
 
     results, pcov = curve_fit(
-        yamamoto_wrapper, log_c_salt_at_max_M, log_gradient_slope, bounds=bounds
+        yamamoto_wrapper, log_c_salt_at_max_M, log_gradient_slope, bounds=bounds, p0=(1, 1)
     )
 
     return results