diff --git a/media/base/buffer_writer_unittest.cc b/media/base/buffer_writer_unittest.cc
index 0aacd83f38..89ce11d194 100644
--- a/media/base/buffer_writer_unittest.cc
+++ b/media/base/buffer_writer_unittest.cc
@@ -27,8 +27,8 @@ const uint16 kuint16 = 1000;
 const int16 kint16 = -1000;
 const uint32 kuint32 = 1000000;
 const int32 kint32 = -1000000;
-const uint64 kuint64 = 10000000000;
-const int64 kint64 = -10000000000;
+const uint64 kuint64 = 10000000000ULL;
+const int64 kint64 = -10000000000LL;
 const uint8 kuint8Array[] = {10, 1, 100, 5, 3, 60};
 }  // namespace
 
diff --git a/media/base/muxer_util_unittest.cc b/media/base/muxer_util_unittest.cc
index 1d411f4f5b..712398a064 100644
--- a/media/base/muxer_util_unittest.cc
+++ b/media/base/muxer_util_unittest.cc
@@ -94,7 +94,7 @@ TEST(MuxerUtilTest, GetSegmentNameWithIndexZero) {
 }
 
 TEST(MuxerUtilTest, GetSegmentNameLargeTime) {
-  const uint64 kSegmentStartTime = 1601599839840;
+  const uint64 kSegmentStartTime = 1601599839840ULL;
   const uint32 kSegmentIndex = 8888888;
 
   EXPECT_EQ("1601599839840",
diff --git a/media/formats/mp2t/ts_section_pes.cc b/media/formats/mp2t/ts_section_pes.cc
index 79481731f1..5e198f33aa 100644
--- a/media/formats/mp2t/ts_section_pes.cc
+++ b/media/formats/mp2t/ts_section_pes.cc
@@ -70,7 +70,7 @@ static bool IsTimestampSectionValid(int64 timestamp_section) {
   // Verify that all the marker bits are set to one.
   return ((timestamp_section & 0x1) != 0) &&
          ((timestamp_section & 0x10000) != 0) &&
-         ((timestamp_section & 0x100000000) != 0);
+         ((timestamp_section & 0x100000000LL) != 0);
 }
 
 static int64 ConvertTimestampSectionToTimestamp(int64 timestamp_section) {
diff --git a/media/formats/mp4/box_definitions_unittest.cc b/media/formats/mp4/box_definitions_unittest.cc
index f4917d9761..e569466221 100644
--- a/media/formats/mp4/box_definitions_unittest.cc
+++ b/media/formats/mp4/box_definitions_unittest.cc
@@ -18,7 +18,7 @@ const uint8 kData4[] = {1, 5, 4, 3, 15};
 const uint8 kData8[] = {1, 8, 42, 98, 156};
 const uint16 kData16[] = {1, 15, 45, 768, 60000};
 const uint32 kData32[] = {1, 24, 99, 1234, 9000000};
-const uint64 kData64[] = {1, 9000000, 12345678901234, 56780909090900};
+const uint64 kData64[] = {1, 9000000, 12345678901234ULL, 56780909090900ULL};
 const media::mp4::TrackType kSampleDescriptionTrackType = media::mp4::kVideo;
 
 // 4-byte FourCC + 4-bytes size.
@@ -209,7 +209,7 @@ class BoxDefinitionsTestGeneral : public testing::Test {
   }
 
   void Modify(MovieHeader* mvhd) {
-    mvhd->duration = 234141324123;
+    mvhd->duration = 234141324123ULL;
     mvhd->next_track_id = 3;
     mvhd->version = 1;
   }
@@ -228,7 +228,7 @@ class BoxDefinitionsTestGeneral : public testing::Test {
   }
 
   void Modify(TrackHeader* tkhd) {
-    tkhd->modification_time = 345388873443;
+    tkhd->modification_time = 345388873443ULL;
     tkhd->volume = 0x0100;
     tkhd->width = 0;
     tkhd->height = 0;
@@ -251,7 +251,7 @@ class BoxDefinitionsTestGeneral : public testing::Test {
   void Modify(EditList* elst) {
     elst->edits.resize(1);
     elst->edits[0].segment_duration = 0;
-    elst->edits[0].media_time = 20364563456;
+    elst->edits[0].media_time = 20364563456LL;
     elst->version = 1;
   }
 
@@ -529,7 +529,7 @@ class BoxDefinitionsTestGeneral : public testing::Test {
   void Modify(Track* trak) { Modify(&trak->media); }
 
   void Fill(MovieExtendsHeader* mehd) {
-    mehd->fragment_duration = 23489038090;
+    mehd->fragment_duration = 23489038090ULL;
     mehd->version = 1;
   }
 
@@ -572,7 +572,7 @@ class BoxDefinitionsTestGeneral : public testing::Test {
   void Modify(Movie* moov) { moov->tracks.resize(1); }
 
   void Fill(TrackFragmentDecodeTime* tfdt) {
-    tfdt->decode_time = 234029673820;
+    tfdt->decode_time = 234029673820ULL;
     tfdt->version = 1;
   }
 
@@ -709,7 +709,7 @@ class BoxDefinitionsTestGeneral : public testing::Test {
   }
 
   void Modify(SegmentIndex* sidx) {
-    sidx->earliest_presentation_time = 2348677865434;
+    sidx->earliest_presentation_time = 2348677865434ULL;
     sidx->references.resize(3);
     sidx->references[2] = sidx->references[1];
     sidx->references[2].subsegment_duration = 87662;