diff --git a/ChangeLog b/ChangeLog
index 6f377b312..0ab12ff54 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,9 @@
+2020-12-24  Werner Lemberg  <wl@gnu.org>
+
+	[sdf] Fix `make multi`.
+
+	* src/sdf/ftsdf.c: Include `ftoutln.h`.
+
 2020-12-24  Werner Lemberg  <wl@gnu.org>
 
 	[sdf] Fix tracing.
diff --git a/src/sdf/ftsdf.c b/src/sdf/ftsdf.c
index ef028d910..175d372f4 100644
--- a/src/sdf/ftsdf.c
+++ b/src/sdf/ftsdf.c
@@ -20,6 +20,7 @@
 
 #include <freetype/internal/ftobjs.h>
 #include <freetype/internal/ftdebug.h>
+#include <freetype/ftoutln.h>
 #include <freetype/fttrigon.h>
 #include "ftsdf.h"