diff --git a/ChangeLog b/ChangeLog
index 772ea85c1..87f3d1795 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,13 @@
+2018-07-12  Werner Lemberg  <wl@gnu.org>
+
+	* src/base/ftoutln.c (FT_Outline_Get_Orientation): Init `cbox'.
+
+	Taken from patch #9667, written by Steve Langasek
+	<vorlon@debian.org>.
+
+	This fixes a build failure (most probably a bug in gcc) on ppc64el
+	when building with -O3.
+
 2018-07-05  Werner Lemberg  <wl@gnu.org>
 
 	Fix typo (#54238).
diff --git a/src/base/ftoutln.c b/src/base/ftoutln.c
index 2d2fc20ce..99edb0e0e 100644
--- a/src/base/ftoutln.c
+++ b/src/base/ftoutln.c
@@ -1044,7 +1044,7 @@
   FT_EXPORT_DEF( FT_Orientation )
   FT_Outline_Get_Orientation( FT_Outline*  outline )
   {
-    FT_BBox     cbox;
+    FT_BBox     cbox = { 0, 0, 0, 0 };
     FT_Int      xshift, yshift;
     FT_Vector*  points;
     FT_Vector   v_prev, v_cur;