diff --git a/protos/CoventryVehicle.proto b/protos/CoventryVehicle.proto
index 493be40..a18e2c4 100644
--- a/protos/CoventryVehicle.proto
+++ b/protos/CoventryVehicle.proto
@@ -3,7 +3,7 @@ PROTO CoventryVehicle [
   field SFRotation rotation        0 0 0 0            # Is `Transform.rotation`.
   field SFString   name            "coventry"               # Is `Solid.name`.
   field SFString   controller      ""                 # Is `Robot.controller`.
-  field SFString   controllerArgs  ""                      # Is `Robot.controllerArgs`.
+  field MFString     controllerArgs           [ ]
   field SFBool     synchronization TRUE                    # Is `Robot.synchronization`.
   field MFNode     moreAddons   []  
   
diff --git a/protos/FsaiVehicle.proto b/protos/FsaiVehicle.proto
index e2ddba3..37269c5 100644
--- a/protos/FsaiVehicle.proto
+++ b/protos/FsaiVehicle.proto
@@ -9,7 +9,7 @@ PROTO FsaiVehicle [
   field SFRotation rotation        0 0 0 0            # Is `Transform.rotation`.
   field SFString   name            "fsaivehicle"       # Is `Solid.name`.
   field SFString   controller      ""                      # Is `Robot.controller`.
-  field SFString   controllerArgs  ""                      # Is `Robot.controllerArgs`.
+  field MFString     controllerArgs           [ ]
   field SFBool     synchronization TRUE                    # Is `Robot.synchronization`.
   field SFColor    color           0.3 0.3 0.7             # Is `Material.diffuseColor`.
   field SFFloat    wheelbase 1.545
diff --git a/protos/SimpleVehicle.proto b/protos/SimpleVehicle.proto
index dbe17b9..31c3f12 100644
--- a/protos/SimpleVehicle.proto
+++ b/protos/SimpleVehicle.proto
@@ -9,7 +9,7 @@ PROTO SimpleVehicle [
   field SFRotation rotation        0 0 0 0            # Is `Transform.rotation`.
   field SFString   name            "vehicle"               # Is `Solid.name`.
   field SFString   controller      "vehicle_driver_futura" # Is `Robot.controller`.
-  field SFString   controllerArgs  ""                      # Is `Robot.controllerArgs`.
+  field MFString     controllerArgs           [ ]
   field SFBool     synchronization TRUE                    # Is `Robot.synchronization`.
   #field SFColor    color           0.3 0.3 0.7             # Is `Material.diffuseColor`.
   field SFFloat    wheelbase 0.37