diff --git a/services/core/java/com/android/server/DropBoxManagerService.java b/services/core/java/com/android/server/DropBoxManagerService.java
index 887de74f1cf9a..09fa006c76693 100644
--- a/services/core/java/com/android/server/DropBoxManagerService.java
+++ b/services/core/java/com/android/server/DropBoxManagerService.java
@@ -861,10 +861,13 @@ public final class DropBoxManagerService extends SystemService {
             } catch (IllegalArgumentException e) {  // restat throws this on error
                 throw new IOException("Can't restat: " + mDropBoxDir);
             }
-            int available = mStatFs.getAvailableBlocks();
-            int nonreserved = available - mStatFs.getBlockCount() * reservePercent / 100;
+            long available = mStatFs.getAvailableBlocksLong();
+            long nonreserved = available - mStatFs.getBlockCountLong() * reservePercent / 100;
+            long maxAvailableLong = nonreserved * quotaPercent / 100;
+            int maxAvailable = Math.toIntExact(Math.max(0,
+                    Math.min(maxAvailableLong, Integer.MAX_VALUE)));
             int maximum = quotaKb * 1024 / mBlockSize;
-            mCachedQuotaBlocks = Math.min(maximum, Math.max(0, nonreserved * quotaPercent / 100));
+            mCachedQuotaBlocks = Math.min(maximum, maxAvailable);
             mCachedQuotaUptimeMillis = uptimeMillis;
         }