diff --git a/content/media/GraphDriver.cpp b/content/media/GraphDriver.cpp
index a73c1194d05..6dc7f9aaf73 100644
--- a/content/media/GraphDriver.cpp
+++ b/content/media/GraphDriver.cpp
@@ -89,7 +89,7 @@ void GraphDriver::UpdateStateComputedTime(GraphTime aStateComputedTime)
   // means the driver would be have been blocking indefinitly, but the graph has
   // been woken up right after having been to sleep.
   if (aStateComputedTime < mStateComputedTime) {
-    printf("State time can't go backward %ld < mStateComputedTime.\n", aStateComputedTime, mStateComputedTime);
+    printf("State time can't go backward %ld < %ld.\n", static_cast<long>(aStateComputedTime), static_cast<long>(mStateComputedTime));
   }
 
   mStateComputedTime = aStateComputedTime;