diff --git a/drivers/gles3/rasterizer_scene_gles3.cpp b/drivers/gles3/rasterizer_scene_gles3.cpp
index 3b14b27ab80..dbbaa62bc25 100644
--- a/drivers/gles3/rasterizer_scene_gles3.cpp
+++ b/drivers/gles3/rasterizer_scene_gles3.cpp
@@ -3554,7 +3554,7 @@ void RasterizerSceneGLES3::_post_process(Environment *env, const CameraMatrix &p
 		glBindFramebuffer(GL_DRAW_FRAMEBUFFER, 0);
 	}
 
-	if (!env || storage->frame.current_rt->flags[RasterizerStorage::RENDER_TARGET_TRANSPARENT]) {
+	if (!env || storage->frame.current_rt->flags[RasterizerStorage::RENDER_TARGET_TRANSPARENT] || storage->frame.current_rt->width < 4 || storage->frame.current_rt->height < 4) { //no post process on small render targets
 		//no environment or transparent render, simply return and convert to SRGB
 		glBindFramebuffer(GL_FRAMEBUFFER, storage->frame.current_rt->fbo);
 		glActiveTexture(GL_TEXTURE0);