diff --git a/src/util.rs b/src/util.rs
index 0894c80..7b94987 100644
--- a/src/util.rs
+++ b/src/util.rs
@@ -41,6 +41,7 @@ pub(crate) fn transpose_codepoints_in_range(
     range_start: u32,
     range_end: u32,
 ) -> String {
+    #[cfg(debug_assertions)]
     debug_assert_transpose_codepoints_range(distance, range_start, range_end);
 
     text.chars()
@@ -80,7 +81,9 @@ pub(crate) fn transpose_codepoints_in_range_in_place(
     range_start: u32,
     range_end: u32,
 ) {
+    #[cfg(debug_assertions)]
     debug_assert_transpose_codepoints_range(distance, range_start, range_end);
+    #[cfg(debug_assertions)]
     debug_assert_transpose_codepoints_range_same_width(distance, range_start, range_end);
 
     let mut byte_index = 0;