diff --git a/src/util/postprocessing_shader_glsl.cpp b/src/util/postprocessing_shader_glsl.cpp
index c3639252d..070f07bea 100644
--- a/src/util/postprocessing_shader_glsl.cpp
+++ b/src/util/postprocessing_shader_glsl.cpp
@@ -190,12 +190,17 @@ GPUDevice::PresentResult PostProcessing::GLSLShader::Apply(GPUTexture* input_col
 
   g_gpu_device->SetPipeline(m_pipeline.get());
   g_gpu_device->SetTextureSampler(0, input_color, m_sampler.get());
-  g_gpu_device->SetViewportAndScissor(final_rect);
+
+  // need to flip the rect, since we're not drawing the entire fb
+  const GSVector4i real_final_rect =
+    g_gpu_device->UsesLowerLeftOrigin() ? g_gpu_device->FlipToLowerLeft(final_rect, target_height) : final_rect;
+  g_gpu_device->SetViewportAndScissor(real_final_rect);
 
   const u32 uniforms_size = GetUniformsSize();
   void* uniforms = g_gpu_device->MapUniformBuffer(uniforms_size);
-  FillUniformBuffer(uniforms, final_rect.left, final_rect.top, final_rect.width(), final_rect.height(), target_width,
-                    target_height, orig_width, orig_height, native_width, native_height, time);
+  FillUniformBuffer(uniforms, real_final_rect.left, real_final_rect.top, real_final_rect.width(),
+                    real_final_rect.height(), target_width, target_height, orig_width, orig_height, native_width,
+                    native_height, time);
   g_gpu_device->UnmapUniformBuffer(uniforms_size);
   g_gpu_device->Draw(3, 0);
   return GPUDevice::PresentResult::OK;