diff --git a/net/src/main/java/com/topjohnwu/net/ProgressInputStream.java b/net/src/main/java/com/topjohnwu/net/ProgressInputStream.java
index 843f6dd18..6d495258f 100644
--- a/net/src/main/java/com/topjohnwu/net/ProgressInputStream.java
+++ b/net/src/main/java/com/topjohnwu/net/ProgressInputStream.java
@@ -19,7 +19,7 @@ public class ProgressInputStream extends FilterInputStream {
     @Override
     public int read() throws IOException {
         int b = super.read();
-        if (b >= 0) {
+        if (totalBytes > 0 && b >= 0) {
             bytesDownloaded++;
             Networking.mainHandler.post(() -> progress.onProgress(bytesDownloaded, totalBytes));
         }
@@ -34,7 +34,7 @@ public class ProgressInputStream extends FilterInputStream {
     @Override
     public int read(byte[] b, int off, int len) throws IOException {
         int sz = super.read(b, off, len);
-        if (sz > 0) {
+        if (totalBytes > 0 && sz > 0) {
             bytesDownloaded += sz;
             Networking.mainHandler.post(() -> progress.onProgress(bytesDownloaded, totalBytes));
         }