diff --git a/src/group_gui.cpp b/src/group_gui.cpp
--- a/src/group_gui.cpp
+++ b/src/group_gui.cpp
@@ -533,7 +533,7 @@ public:
 
 		/* If not a default group and the group has replace protection, show an enabled replace sprite. */
 		uint16 protect_sprite = SPR_GROUP_REPLACE_OFF_TRAIN;
-		if (!IsDefaultGroupID(this->vli.index) && !IsAllGroupID(this->vli.index) && Group::Get(this->vli.index)->replace_protection) protect_sprite = SPR_GROUP_REPLACE_ON_TRAIN;
+		if (!IsDefaultGroupID(this->vli.index) && !IsAllGroupID(this->vli.index) && HasBit(Group::Get(this->vli.index)->flags, GroupFlags::GF_REPLACE_PROTECTION)) protect_sprite = SPR_GROUP_REPLACE_ON_TRAIN;
 		this->GetWidget<NWidgetCore>(WID_GL_REPLACE_PROTECTION)->widget_data = protect_sprite + this->vli.vtype;
 
 		/* Set text of "group by" dropdown widget. */
@@ -601,7 +601,7 @@ public:
 
 					assert(g->owner == this->owner);
 
-					DrawGroupInfo(y1, r.left, r.right, g->index, this->indents[i] * LEVEL_WIDTH, g->replace_protection, g->folded || (i + 1 < (int)this->groups.size() && indents[i + 1] > this->indents[i]));
+					DrawGroupInfo(y1, r.left, r.right, g->index, this->indents[i] * LEVEL_WIDTH, HasBit(g->flags, GroupFlags::GF_REPLACE_PROTECTION), g->folded || (i + 1 < (int)this->groups.size() && indents[i + 1] > this->indents[i]));
 
 					y1 += this->tiny_step_height;
 				}
@@ -798,7 +798,7 @@ public:
 			case WID_GL_REPLACE_PROTECTION: {
 				const Group *g = Group::GetIfValid(this->vli.index);
 				if (g != nullptr) {
-					DoCommandP(0, this->vli.index, (g->replace_protection ? 0 : 1) | (_ctrl_pressed << 1), CMD_SET_GROUP_REPLACE_PROTECTION);
+					DoCommandP(0, this->vli.index, (HasBit(g->flags, GroupFlags::GF_REPLACE_PROTECTION) ? 0 : 1) | (_ctrl_pressed << 1), CMD_SET_GROUP_REPLACE_PROTECTION);
 				}
 				break;
 			}