diff --git a/src/rendering/hwrenderer/postprocessing/hw_postprocess.cpp b/src/rendering/hwrenderer/postprocessing/hw_postprocess.cpp
index 838c078e3..e0de225dc 100644
--- a/src/rendering/hwrenderer/postprocessing/hw_postprocess.cpp
+++ b/src/rendering/hwrenderer/postprocessing/hw_postprocess.cpp
@@ -878,8 +878,16 @@ PPCustomShaderInstance::PPCustomShaderInstance(PostProcessShader *desc) : Desc(d
 
 	// Setup pipeline
 	FString pipelineInOut;
-	pipelineInOut += "layout(location=0) in vec2 TexCoord;\n";
-	pipelineInOut += "layout(location=0) out vec4 FragColor;\n";
+	if (screen->IsVulkan())
+	{
+		pipelineInOut += "layout(location=0) in vec2 TexCoord;\n";
+		pipelineInOut += "layout(location=0) out vec4 FragColor;\n";
+	}
+	else 
+	{
+		pipelineInOut += "in vec2 TexCoord;\n";
+		pipelineInOut += "out vec4 FragColor;\n";
+	}
 
 	FString prolog;
 	prolog += uniformTextures;
diff --git a/src/rendering/vulkan/system/vk_framebuffer.h b/src/rendering/vulkan/system/vk_framebuffer.h
index 98d8c9412..05302da13 100644
--- a/src/rendering/vulkan/system/vk_framebuffer.h
+++ b/src/rendering/vulkan/system/vk_framebuffer.h
@@ -63,6 +63,7 @@ public:
 
 	VulkanFrameBuffer(void *hMonitor, bool fullscreen, VulkanDevice *dev);
 	~VulkanFrameBuffer();
+	bool IsVulkan() override { return true; }
 
 	void Update();
 
diff --git a/src/v_video.h b/src/v_video.h
index d1178d4c0..823af8b4b 100644
--- a/src/v_video.h
+++ b/src/v_video.h
@@ -381,6 +381,7 @@ public:
 	DFrameBuffer (int width=1, int height=1);
 	virtual ~DFrameBuffer();
 	virtual void InitializeState() = 0;	// For stuff that needs 'screen' set.
+	virtual bool IsVulkan() { return false; }
 
 	void SetSize(int width, int height);
 	void SetVirtualSize(int width, int height)