diff --git a/media/libstagefright/MPEG4Extractor.cpp b/media/libstagefright/MPEG4Extractor.cpp
index bfdff38..13b6fce 100755
--- a/media/libstagefright/MPEG4Extractor.cpp
+++ b/media/libstagefright/MPEG4Extractor.cpp
@@ -1022,7 +1022,7 @@
                     int64_t delay = (media_time  * samplerate + 500000) / 1000000;
                     mLastTrack->meta->setInt32(kKeyEncoderDelay, delay);
 
-                    int64_t paddingus = duration - (segment_duration + media_time);
+                    int64_t paddingus = duration - (int64_t)(segment_duration + media_time);
                     if (paddingus < 0) {
                         // track duration from media header (which is what kKeyDuration is) might
                         // be slightly shorter than the segment duration, which would make the