diff --git a/library/dash/src/main/java/com/google/android/exoplayer2/source/dash/DefaultDashChunkSource.java b/library/dash/src/main/java/com/google/android/exoplayer2/source/dash/DefaultDashChunkSource.java
index fc273558fe..a61b951dbb 100644
--- a/library/dash/src/main/java/com/google/android/exoplayer2/source/dash/DefaultDashChunkSource.java
+++ b/library/dash/src/main/java/com/google/android/exoplayer2/source/dash/DefaultDashChunkSource.java
@@ -818,6 +818,12 @@ public class DefaultDashChunkSource implements DashChunkSource {
     }
 
     public boolean isSegmentAvailableAtFullNetworkSpeed(long segmentNum, long nowPeriodTimeUs) {
+      if (segmentIndex.isExplicit()) {
+        // We don't support segment availability for explicit indices (internal ref: b/172894901).
+        // Hence, also assume all segments in explicit indices are always available at full network
+        // speed even if they end in the future.
+        return true;
+      }
       return nowPeriodTimeUs == C.TIME_UNSET || getSegmentEndTimeUs(segmentNum) <= nowPeriodTimeUs;
     }
   }