diff --git a/include/util/matrix.h b/include/util/matrix.h
index 059a3bb1f..e6197cecc 100644
--- a/include/util/matrix.h
+++ b/include/util/matrix.h
@@ -24,11 +24,11 @@ void wlr_matrix_transform(float mat[static 9],
 	enum wl_output_transform transform);
 
 /** Shortcut for the various matrix operations involved in projecting the
- *  specified wlr_box onto a given orthographic projection with a given
- *  rotation. The result is written to mat, which can be applied to each
- *  coordinate of the box to get a new coordinate from [-1,1]. */
-void wlr_matrix_project_box(float mat[static 9], const struct wlr_box *box,
-	enum wl_output_transform transform, const float projection[static 9]);
+ *  specified wlr_box onto a given orthographic projection. The result is
+ *  written to mat, which can be applied to each coordinate of the box to get a
+ *  new coordinate from [-1,1].
+ */
+void wlr_matrix_project_box(float mat[static 9], const struct wlr_box *box);
 
 /**
  * Writes a 2D orthographic projection matrix to mat of (width, height) with a
diff --git a/render/vulkan/pass.c b/render/vulkan/pass.c
index 032fcc7b2..92c771f06 100644
--- a/render/vulkan/pass.c
+++ b/render/vulkan/pass.c
@@ -618,9 +618,8 @@ static void render_pass_add_rect(struct wlr_render_pass *wlr_pass,
 
 	switch (options->blend_mode) {
 	case WLR_RENDER_BLEND_MODE_PREMULTIPLIED:;
-		float proj[9], matrix[9];
-		wlr_matrix_identity(proj);
-		wlr_matrix_project_box(matrix, &box, WL_OUTPUT_TRANSFORM_NORMAL, proj);
+		float matrix[9];
+		wlr_matrix_project_box(matrix, &box);
 		wlr_matrix_multiply(matrix, pass->projection, matrix);
 
 		struct wlr_vk_render_format_setup *setup = pass->srgb_pathway ?
@@ -709,9 +708,9 @@ static void render_pass_add_texture(struct wlr_render_pass *wlr_pass,
 	wlr_render_texture_options_get_dst_box(options, &dst_box);
 	float alpha = wlr_render_texture_options_get_alpha(options);
 
-	float proj[9], matrix[9];
-	wlr_matrix_identity(proj);
-	wlr_matrix_project_box(matrix, &dst_box, options->transform, proj);
+	float matrix[9];
+	wlr_matrix_project_box(matrix, &dst_box);
+	wlr_matrix_transform(matrix, options->transform);
 	wlr_matrix_multiply(matrix, pass->projection, matrix);
 
 	struct wlr_vk_vert_pcr_data vert_pcr_data = {
diff --git a/util/matrix.c b/util/matrix.c
index 7fdd1fae0..d049b6ce3 100644
--- a/util/matrix.c
+++ b/util/matrix.c
@@ -119,8 +119,7 @@ void matrix_projection(float mat[static 9], int width, int height,
 	mat[8] = 1.0f;
 }
 
-void wlr_matrix_project_box(float mat[static 9], const struct wlr_box *box,
-		enum wl_output_transform transform, const float projection[static 9]) {
+void wlr_matrix_project_box(float mat[static 9], const struct wlr_box *box) {
 	int x = box->x;
 	int y = box->y;
 	int width = box->width;
@@ -130,10 +129,4 @@ void wlr_matrix_project_box(float mat[static 9], const struct wlr_box *box,
 	wlr_matrix_translate(mat, x, y);
 
 	wlr_matrix_scale(mat, width, height);
-
-	if (transform != WL_OUTPUT_TRANSFORM_NORMAL) {
-		wlr_matrix_transform(mat, transform);
-	}
-
-	wlr_matrix_multiply(mat, projection, mat);
 }