diff --git a/cli/src/bin/usage-docs.rs b/cli/src/bin/usage-docs.rs
index baa4079e1..cf3998b5b 100644
--- a/cli/src/bin/usage-docs.rs
+++ b/cli/src/bin/usage-docs.rs
@@ -43,7 +43,7 @@ fn process(_ctx: &PreprocessorContext, mut book: Book) -> Result<Book, Error> {
                     chapter
                         .source_path
                         .as_ref()
-                        .unwrap_or(chapter.path.as_ref().unwrap())
+                        .unwrap_or_else(|| chapter.path.as_ref().unwrap())
                 );
             }
             chapter.content = new_content;