diff --git a/modules/libjar/nsJARInputStream.cpp b/modules/libjar/nsJARInputStream.cpp
index 53c89ef2854..0b08edc938f 100644
--- a/modules/libjar/nsJARInputStream.cpp
+++ b/modules/libjar/nsJARInputStream.cpp
@@ -276,6 +276,9 @@ nsJARInputStream::IsNonBlocking(bool *aNonBlocking)
 NS_IMETHODIMP
 nsJARInputStream::Close()
 {
+    if (mMode == MODE_INFLATE) {
+        inflateEnd(&mZs);
+    }
     mMode = MODE_CLOSED;
     mFd = nsnull;
     return NS_OK;