diff --git a/base64.h b/base64.h
index 8ad374916377a5ad42821c666c929751fe5173e2..9766c4bf62f3e664077a5043c4022a360f289161 100644
--- a/base64.h
+++ b/base64.h
@@ -54,7 +54,7 @@ extern "C" {
 /* We have at most 4 buffered bits, and a total of (4 + length * 8) bits. */
 #define BASE64_ENCODE_LENGTH(length) (((length) * 8 + 4)/6)
 
-/* Maximum lengbth of output generated by base64_encode_final. */
+/* Maximum length of output generated by base64_encode_final. */
 #define BASE64_ENCODE_FINAL_LENGTH 3
 
 /* Exact length of output generated by base64_encode_raw, including