diff --git a/libfprint/fp_internal.h b/libfprint/fp_internal.h
index 6b74c4a..57d1e35 100644
--- a/libfprint/fp_internal.h
+++ b/libfprint/fp_internal.h
@@ -418,9 +418,5 @@ void fpi_imgdev_image_captured(struct fp_img_dev *imgdev, struct fp_img *img);
 void fpi_imgdev_abort_scan(struct fp_img_dev *imgdev, int result);
 void fpi_imgdev_session_error(struct fp_img_dev *imgdev, int error);
 
-/* utils */
-int fpi_std_sq_dev(const unsigned char *buf, int size);
-int fpi_mean_sq_diff_norm(unsigned char *buf1, unsigned char *buf2, int size);
-
 #endif