diff --git a/ChangeLog.d/fix-mingw-ansi-stdio.txt b/ChangeLog.d/fix-mingw-ansi-stdio.txt
new file mode 100644
index 0000000000..d9293d95ca
--- /dev/null
+++ b/ChangeLog.d/fix-mingw-ansi-stdio.txt
@@ -0,0 +1,4 @@
+Bugfix
+   * Fix a build failure with MinGW when the __USE_MINGW_ANSI_STDIO option
+     is set. This was caused by the wrong format specifier being used to
+     print long long values (MBEDTLS_PRINTF_LONGLONG).