1 files changed, 2 insertions, 0 deletions
diff --git a/dom/base/TimerClamping.h b/dom/base/TimerClamping.h
index 2ffd6add5..2bd1f019c 100755
--- a/dom/base/TimerClamping.h
+++ b/dom/base/TimerClamping.h
@@ -7,6 +7,8 @@
 #ifndef TimerClamping_h___
 #define TimerClamping_h___
 
+#include <math.h>
+
 namespace mozilla {
 
 class TimerClamping