diff --git a/bioptim/misc/enums.py b/bioptim/misc/enums.py
index cb03658ea..41143d875 100644
--- a/bioptim/misc/enums.py
+++ b/bioptim/misc/enums.py
@@ -110,7 +110,7 @@ class SolutionIntegrator(Enum):
     Selection of integrator to use integrate function
     """
 
-    DEFAULT = ""
+    DEFAULT = "DEFAULT"
     SCIPY_RK23 = "RK23"
     SCIPY_RK45 = "RK45"
     SCIPY_DOP853 = "DOP853"