diff --git a/ChangeLog.d/issue3819.txt b/ChangeLog.d/issue3819.txt
index 7723c650f7..38b483a586 100644
--- a/ChangeLog.d/issue3819.txt
+++ b/ChangeLog.d/issue3819.txt
@@ -1,5 +1,5 @@
 Security
    * Fix a security reduction error that caused all bits of the nonce
      to be zero in mbedtls_ctr_drbg_reseed_internal.  This prevented
-	 the security strength from reaching the level required by NIST.
+     the security strength from reaching the level required by NIST.
      Found by John Stroebel in #3819 and fixed in #3973.