diff --git a/src/libslic3r/Print.cpp b/src/libslic3r/Print.cpp
index f8d19396a..3e5d88015 100644
--- a/src/libslic3r/Print.cpp
+++ b/src/libslic3r/Print.cpp
@@ -1282,25 +1282,25 @@ std::string Print::validate() const
 
         for (PrintObject *object : m_objects) {
             if (object->config().raft_layers > 0 || object->config().support_material.value) {
-				if ((object->config().support_material_extruder == 0 || object->config().support_material_interface_extruder == 0) && max_nozzle_diameter - min_nozzle_diameter > EPSILON) {
-                // The object has some form of support and either support_material_extruder or support_material_interface_extruder
-                // will be printed with the current tool without a forced tool change. Play safe, assert that all object nozzles
-                // are of the same diameter.
+                if ((object->config().support_material_extruder == 0 || object->config().support_material_interface_extruder == 0) && max_nozzle_diameter - min_nozzle_diameter > EPSILON) {
+                    // The object has some form of support and either support_material_extruder or support_material_interface_extruder
+                    // will be printed with the current tool without a forced tool change. Play safe, assert that all object nozzles
+                    // are of the same diameter.
                     return L("Printing with multiple extruders of differing nozzle diameters. "
                            "If support is to be printed with the current extruder (support_material_extruder == 0 or support_material_interface_extruder == 0), "
                            "all nozzles have to be of the same diameter.");
-            }
+                }
                 if (this->has_wipe_tower()) {
                     if (object->config().support_material_contact_distance_type == zdNone) {
-    					// Soluble interface
-    					if (! object->config().support_material_synchronize_layers)
-    						return L("For the Wipe Tower to work with the soluble supports, the support layers need to be synchronized with the object layers.");
-    				} else {
-    					// Non-soluble interface
-                        if (object->config().support_material_contact_distance_type != zdNone || object->config().support_material_interface_extruder != 0)
-    						return L("The Wipe Tower currently supports the non-soluble supports only if they are printed with the current extruder without triggering a tool change. "
-    							     "(both support_material_extruder and support_material_interface_extruder need to be set to 0).");
-    				}
+                        // Soluble interface
+                        if (! object->config().support_material_synchronize_layers)
+                            return L("For the Wipe Tower to work with the soluble supports, the support layers need to be synchronized with the object layers.");
+                    } else {
+                        // Non-soluble interface
+                        if (object->config().support_material_extruder != 0 || object->config().support_material_interface_extruder != 0)
+                            return L("The Wipe Tower currently supports the non-soluble supports only if they are printed with the current extruder without triggering a tool change. "
+                                     "(both support_material_extruder and support_material_interface_extruder need to be set to 0).");
+                    }
                 }
             }