diff --git a/armorforge/kincflags.js b/armorforge/kincflags.js
index 728270e1..9a70c15a 100644
--- a/armorforge/kincflags.js
+++ b/armorforge/kincflags.js
@@ -16,6 +16,7 @@ flags.on_project_created = async function(project) {
 	project.addDefine('IDLE_SLEEP');
 
 	if (graphics === 'vulkan') {
+		project.addDefine('KORE_VKRT');
 		await project.addProject('../armorforge/glsl_to_spirv');
 	}
 }
diff --git a/armorlab/kincflags.js b/armorlab/kincflags.js
index d0c6f4b3..df70df64 100644
--- a/armorlab/kincflags.js
+++ b/armorlab/kincflags.js
@@ -16,6 +16,7 @@ flags.on_project_created = async function(project) {
 	project.addDefine('IDLE_SLEEP');
 
 	if (graphics === 'vulkan') {
+		project.addDefine('KORE_VKRT');
 		await project.addProject('../armorlab/glsl_to_spirv');
 	}
 	await project.addProject('../armorlab/plugins');
diff --git a/armorpaint/kincflags.js b/armorpaint/kincflags.js
index 3fcd5c94..42b90169 100644
--- a/armorpaint/kincflags.js
+++ b/armorpaint/kincflags.js
@@ -15,6 +15,7 @@ flags.on_project_created = async function(project) {
 	project.addDefine('IDLE_SLEEP');
 
 	if (graphics === 'vulkan') {
+		project.addDefine('KORE_VKRT');
 		await project.addProject('../armorpaint/glsl_to_spirv');
 	}
 	if (platform === 'ios') {