Index: /trunk/src/VBox/Runtime/common/zip/pkzipvfs.cpp
===================================================================
--- /trunk/src/VBox/Runtime/common/zip/pkzipvfs.cpp	(revision 51697)
+++ /trunk/src/VBox/Runtime/common/zip/pkzipvfs.cpp	(revision 51698)
@@ -438,5 +438,5 @@
 static uint64_t rtZipPkzipReaderOffLocalHeader(PRTZIPPKZIPREADER pThis)
 {
-    if (pThis->fZip64Ex && pThis->cdh.offLocalFileHeader == -1U)
+    if (pThis->fZip64Ex && pThis->cdh.offLocalFileHeader == (uint32_t)-1)
         return pThis->cd64ex.offLocalFileHeader;
 
@@ -450,5 +450,5 @@
 static uint64_t rtZipPkzipReaderUncompressed(PRTZIPPKZIPREADER pThis)
 {
-    if (pThis->fZip64Ex && pThis->cdh.cbUncompressed == -1U)
+    if (pThis->fZip64Ex && pThis->cdh.cbUncompressed == (uint32_t)-1)
         return pThis->cd64ex.cbUncompressed;
     
@@ -462,5 +462,5 @@
 static uint64_t rtZipPkzipReaderCompressed(PRTZIPPKZIPREADER pThis)
 {
-    if (pThis->fZip64Ex && pThis->cdh.cbCompressed == -1U)
+    if (pThis->fZip64Ex && pThis->cdh.cbCompressed == (uint32_t)-1)
         return pThis->cd64ex.cbCompressed;