diff --git a/gfx/graphite2/src/Collider.cpp b/gfx/graphite2/src/Collider.cpp

--- a/gfx/graphite2/src/Collider.cpp

+++ b/gfx/graphite2/src/Collider.cpp

@@ -21,17 +21,17 @@

 Alternatively, the contents of this file may be used under the terms of the

 Mozilla Public License (http://mozilla.org/MPL) or the GNU General Public

 License, as published by the Free Software Foundation, either version 2

 of the License or (at your option) any later version.

 */

 #include <algorithm>

 #include <limits>

-#include <math.h>

+#include <cmath>

 #include <string>

 #include <functional>

 #include "inc/Collider.h"

 #include "inc/Segment.h"

 #include "inc/Slot.h"

 #include "inc/GlyphCache.h"

 #include "inc/Sparse.h"