diff --git a/include/wlr/types/wlr_matrix.h b/include/wlr/types/wlr_matrix.h
index 7ddfd9d7d..1a8b5be53 100644
--- a/include/wlr/types/wlr_matrix.h
+++ b/include/wlr/types/wlr_matrix.h
@@ -43,11 +43,6 @@ void wlr_matrix_rotate(float mat[static 9], float rad);
 void wlr_matrix_transform(float mat[static 9],
 	enum wl_output_transform transform);
 
-/** Writes a transformation matrix which applies the inverse of
- *  transform to mat, such that  transform × inverse = identity */
-void wlr_matrix_transform_inv(float mat[static 9],
-	enum wl_output_transform transform);
-
 /** Writes a 2D orthographic projection matrix to mat of (width, height) with a
  *  specified wl_output_transform.
  *
diff --git a/types/wlr_matrix.c b/types/wlr_matrix.c
index 2be9ee1e0..a1b2b31a1 100644
--- a/types/wlr_matrix.c
+++ b/types/wlr_matrix.c
@@ -117,33 +117,6 @@ void wlr_matrix_transform(float mat[static 9],
 	wlr_matrix_multiply(mat, mat, transforms[transform]);
 }
 
-void wlr_matrix_transform_inv(float mat[static 9],
-	enum wl_output_transform transform) {
-	enum wl_output_transform inv;
-
-	switch (transform) {
-		case WL_OUTPUT_TRANSFORM_90:
-			inv = WL_OUTPUT_TRANSFORM_270;
-			break;
-		case WL_OUTPUT_TRANSFORM_180:
-			inv = WL_OUTPUT_TRANSFORM_180;
-			break;
-		case WL_OUTPUT_TRANSFORM_270:
-			inv = WL_OUTPUT_TRANSFORM_90;
-			break;
-		case WL_OUTPUT_TRANSFORM_NORMAL:
-		case WL_OUTPUT_TRANSFORM_FLIPPED:
-		case WL_OUTPUT_TRANSFORM_FLIPPED_90:
-		case WL_OUTPUT_TRANSFORM_FLIPPED_180:
-		case WL_OUTPUT_TRANSFORM_FLIPPED_270:
-		default:
-			inv = transform;
-			break;
-	}
-
-	wlr_matrix_multiply(mat, mat, transforms[inv]);
-}
-
 // Equivalent to glOrtho(0, width, 0, height, 1, -1) with the transform applied
 void wlr_matrix_projection(float mat[static 9], int width, int height,
 		enum wl_output_transform transform) {