diff --git a/modules/navigation_dummy/dummy_navigation_2d_server.cpp b/modules/navigation_dummy/dummy_navigation_2d_server.cpp
index c8561753b..3e79025e4 100644
--- a/modules/navigation_dummy/dummy_navigation_2d_server.cpp
+++ b/modules/navigation_dummy/dummy_navigation_2d_server.cpp
@@ -30,6 +30,11 @@
 
 #include "dummy_navigation_2d_server.h"
 
+#include "scene/2d/navigation_polygon.h"
+
+void DummyNavigation2DServer::region_set_navpoly(RID p_region, Ref<NavigationPolygon> p_nav_mesh) const {
+}
+
 DummyNavigation2DServer::DummyNavigation2DServer() {
 }
 
diff --git a/modules/navigation_dummy/dummy_navigation_2d_server.h b/modules/navigation_dummy/dummy_navigation_2d_server.h
index 6f42b9b24..f23106b24 100644
--- a/modules/navigation_dummy/dummy_navigation_2d_server.h
+++ b/modules/navigation_dummy/dummy_navigation_2d_server.h
@@ -1,8 +1,12 @@
 #ifndef DUMMY_NAVIGATION_2D_SERVER_H
 #define DUMMY_NAVIGATION_2D_SERVER_H
 
+#include "core/object/reference.h"
+
 #include "servers/navigation_2d_server.h"
 
+class NavigationPolygon;
+
 class DummyNavigation2DServer : public Navigation2DServer {
 public:
 	virtual Array get_maps() const { return Array(); }
@@ -34,7 +38,7 @@ public:
 	virtual void region_set_navigation_layers(RID p_region, uint32_t p_navigation_layers) const {}
 	virtual uint32_t region_get_navigation_layers(RID p_region) const { return 0; }
 	virtual void region_set_transform(RID p_region, Transform2D p_transform) const {}
-	virtual void region_set_navpoly(RID p_region, Ref<NavigationPolygon> p_nav_mesh) const {}
+	virtual void region_set_navpoly(RID p_region, Ref<NavigationPolygon> p_nav_mesh) const;
 	virtual int region_get_connections_count(RID p_region) const { return 0; }
 	virtual Vector2 region_get_connection_pathway_start(RID p_region, int p_connection_id) const { return Vector2(); }
 	virtual Vector2 region_get_connection_pathway_end(RID p_region, int p_connection_id) const { return Vector2(); }
diff --git a/modules/navigation_dummy/dummy_navigation_server.cpp b/modules/navigation_dummy/dummy_navigation_server.cpp
index ecad33d0c..c82532d3a 100644
--- a/modules/navigation_dummy/dummy_navigation_server.cpp
+++ b/modules/navigation_dummy/dummy_navigation_server.cpp
@@ -1,6 +1,13 @@
 
 #include "dummy_navigation_server.h"
 
+#include "scene/resources/navigation_mesh.h"
+
+void DummyNavigationServer::region_set_navmesh(RID p_region, Ref<NavigationMesh> p_nav_mesh) const {
+}
+void DummyNavigationServer::region_bake_navmesh(Ref<NavigationMesh> r_mesh, Node *p_node) const {
+}
+
 DummyNavigationServer::DummyNavigationServer() {
 }
 
diff --git a/modules/navigation_dummy/dummy_navigation_server.h b/modules/navigation_dummy/dummy_navigation_server.h
index 12235fdbc..3d4823fe2 100644
--- a/modules/navigation_dummy/dummy_navigation_server.h
+++ b/modules/navigation_dummy/dummy_navigation_server.h
@@ -1,8 +1,11 @@
 #ifndef DUMMY_NAVIGATION_SERVER_H
 #define DUMMY_NAVIGATION_SERVER_H
 
+#include "core/object/reference.h"
+
 #include "servers/navigation_server.h"
 
+class NavigationMesh;
 class DummyNavigationServer : public NavigationServer {
 public:
 	virtual Array get_maps() const { return Array(); }
@@ -38,8 +41,8 @@ public:
 	virtual void region_set_navigation_layers(RID p_region, uint32_t p_navigation_layers) const {}
 	virtual uint32_t region_get_navigation_layers(RID p_region) const { return 0; }
 	virtual void region_set_transform(RID p_region, Transform p_transform) const {}
-	virtual void region_set_navmesh(RID p_region, Ref<NavigationMesh> p_nav_mesh) const {}
-	virtual void region_bake_navmesh(Ref<NavigationMesh> r_mesh, Node *p_node) const {}
+	virtual void region_set_navmesh(RID p_region, Ref<NavigationMesh> p_nav_mesh) const;
+	virtual void region_bake_navmesh(Ref<NavigationMesh> r_mesh, Node *p_node) const;
 	virtual int region_get_connections_count(RID p_region) const { return 0; }
 	virtual Vector3 region_get_connection_pathway_start(RID p_region, int p_connection_id) const { return Vector3(); }
 	virtual Vector3 region_get_connection_pathway_end(RID p_region, int p_connection_id) const { return Vector3(); }