diff --git a/src/afs/afs_segments.c b/src/afs/afs_segments.c
index a821d73a0c..1da015db6a 100644
--- a/src/afs/afs_segments.c
+++ b/src/afs/afs_segments.c
@@ -644,7 +644,7 @@ afs_TruncateAllSegments(register struct vcache *avc, afs_size_t alen,
     register struct dcache *tdc;
     register afs_int32 code;
     register afs_int32 index;
-    afs_int32 newSize;
+    afs_size_t newSize;
 
     int dcCount, dcPos;
     struct dcache **tdcArray;
@@ -748,12 +748,12 @@ afs_TruncateAllSegments(register struct vcache *avc, afs_size_t alen,
 	if (newSize < 0)
 	    newSize = 0;
 	ObtainSharedLock(&tdc->lock, 672);
-	if (newSize < tdc->f.chunkBytes) {
+	if (newSize < tdc->f.chunkBytes && newSize < MAX_AFS_UINT32) {
 	    UpgradeSToWLock(&tdc->lock, 673);
 	    tfile = afs_CFileOpen(&tdc->f.inode);
-	    afs_CFileTruncate(tfile, newSize);
+	    afs_CFileTruncate(tfile, (afs_int32)newSize);
 	    afs_CFileClose(tfile);
-	    afs_AdjustSize(tdc, newSize);
+	    afs_AdjustSize(tdc, (afs_int32)newSize);
 	    if (alen < tdc->validPos) {
                 if (alen < AFS_CHUNKTOBASE(tdc->f.chunk))
                     tdc->validPos = 0;