diff --git a/widget/gonk/GeckoTouchDispatcher.cpp b/widget/gonk/GeckoTouchDispatcher.cpp
index 24053ef7623..cfd6598d85e 100644
--- a/widget/gonk/GeckoTouchDispatcher.cpp
+++ b/widget/gonk/GeckoTouchDispatcher.cpp
@@ -294,7 +294,7 @@ GeckoTouchDispatcher::ResampleTouchMoves(MultiTouchInput& aOutTouch, TimeStamp a
   TimeDuration touchDiff = currentTouch.mTimeStamp - baseTouch.mTimeStamp;
 
   if (currentTouch.mTimeStamp < sampleTime) {
-    TimeDuration maxResampleTime = std::min(touchDiff / 2, mMaxPredict);
+    TimeDuration maxResampleTime = std::min(touchDiff / int64_t(2), mMaxPredict);
     TimeStamp maxTimestamp = currentTouch.mTimeStamp + maxResampleTime;
     if (sampleTime > maxTimestamp) {
       sampleTime = maxTimestamp;
diff --git a/xpcom/ds/TimeStamp.h b/xpcom/ds/TimeStamp.h
index fdb87559d60..036ef578c30 100644
--- a/xpcom/ds/TimeStamp.h
+++ b/xpcom/ds/TimeStamp.h
@@ -181,6 +181,11 @@ private:
   // If required, use MultDouble explicitly and with care.
   BaseTimeDuration operator*(const double aMultiplier) const = delete;
 
+  // Block double divisor (for the same reason, and because dividing by
+  // fractional values would otherwise invoke the int64_t variant, and rounding
+  // the passed argument can then cause divide-by-zero) - Bug 1147491.
+  BaseTimeDuration operator/(const double aDivisor) const = delete;
+
 public:
   BaseTimeDuration MultDouble(double aMultiplier) const
   {