diff --git a/citadel/building_robot.md b/citadel/building_robot.md
index 8791168204..11d4494920 100644
--- a/citadel/building_robot.md
+++ b/citadel/building_robot.md
@@ -403,7 +403,7 @@ We didn't use the `relative_to` attribute so the pose is with respect to the fra
         </geometry>
         <material>
             <ambient>0.0 1 0.0 1</ambient>
-            <diffuse>0.0 1 0.0 1 1</diffuse>
+            <diffuse>0.0 1 0.0 1</diffuse>
             <specular>0.0 1 0.0 1</specular>
         </material>
     </visual>
diff --git a/citadel/tutorials/sensors/sensor_tutorial.sdf b/citadel/tutorials/sensors/sensor_tutorial.sdf
index 1ad06ea1a1..430a5ce068 100644
--- a/citadel/tutorials/sensors/sensor_tutorial.sdf
+++ b/citadel/tutorials/sensors/sensor_tutorial.sdf
@@ -317,7 +317,7 @@
                     </geometry>
                     <material>
                         <ambient>0.0 1 0.0 1</ambient>
-                        <diffuse>0.0 1 0.0 1 1</diffuse>
+                        <diffuse>0.0 1 0.0 1</diffuse>
                         <specular>0.0 1 0.0 1</specular>
                     </material>
                 </visual>
diff --git a/dome/building_robot.md b/dome/building_robot.md
index 77387a977a..cbd0a0e24d 100644
--- a/dome/building_robot.md
+++ b/dome/building_robot.md
@@ -332,7 +332,7 @@ We didn't use the `relative_to` attribute so the pose is with respect to the fra
         </geometry>
         <material>
             <ambient>0.0 1 0.0 1</ambient>
-            <diffuse>0.0 1 0.0 1 1</diffuse>
+            <diffuse>0.0 1 0.0 1</diffuse>
             <specular>0.0 1 0.0 1</specular>
         </material>
     </visual>
diff --git a/dome/tutorials/building_robot/building_robot.sdf b/dome/tutorials/building_robot/building_robot.sdf
index 618e77b6ba..b5bba8c85d 100644
--- a/dome/tutorials/building_robot/building_robot.sdf
+++ b/dome/tutorials/building_robot/building_robot.sdf
@@ -198,7 +198,7 @@
                     </geometry>
                     <material>
                         <ambient>0.0 1 0.0 1</ambient>
-                        <diffuse>0.0 1 0.0 1 1</diffuse>
+                        <diffuse>0.0 1 0.0 1</diffuse>
                         <specular>0.0 1 0.0 1</specular>
                     </material>
                 </visual>
diff --git a/dome/tutorials/moving_robot/moving_robot.sdf b/dome/tutorials/moving_robot/moving_robot.sdf
index ace9182bc4..7154e1c0b4 100644
--- a/dome/tutorials/moving_robot/moving_robot.sdf
+++ b/dome/tutorials/moving_robot/moving_robot.sdf
@@ -196,7 +196,7 @@
                     </geometry>
                     <material>
                         <ambient>0.0 1 0.0 1</ambient>
-                        <diffuse>0.0 1 0.0 1 1</diffuse>
+                        <diffuse>0.0 1 0.0 1</diffuse>
                         <specular>0.0 1 0.0 1</specular>
                     </material>
                 </visual>
diff --git a/dome/tutorials/sensors/sensor_tutorial.sdf b/dome/tutorials/sensors/sensor_tutorial.sdf
index 4512d70d49..05d87b3965 100644
--- a/dome/tutorials/sensors/sensor_tutorial.sdf
+++ b/dome/tutorials/sensors/sensor_tutorial.sdf
@@ -317,7 +317,7 @@
                     </geometry>
                     <material>
                         <ambient>0.0 1 0.0 1</ambient>
-                        <diffuse>0.0 1 0.0 1 1</diffuse>
+                        <diffuse>0.0 1 0.0 1</diffuse>
                         <specular>0.0 1 0.0 1</specular>
                     </material>
                 </visual>