diff --git a/core/src/main/groovy/com/muwire/core/upload/ContentUploader.groovy b/core/src/main/groovy/com/muwire/core/upload/ContentUploader.groovy
index 3cb70626..e25b28da 100644
--- a/core/src/main/groovy/com/muwire/core/upload/ContentUploader.groovy
+++ b/core/src/main/groovy/com/muwire/core/upload/ContentUploader.groovy
@@ -106,7 +106,7 @@ class ContentUploader extends Uploader {
             return done ? 100 : 0
         int position = mapped.position()
         int total = request.getRange().end - request.getRange().start
-        (int)(position * 100.0 / total)
+        (int)(position * 100.0d / total)
     }
 
     @Override
diff --git a/core/src/main/groovy/com/muwire/core/upload/HashListUploader.groovy b/core/src/main/groovy/com/muwire/core/upload/HashListUploader.groovy
index e344a29a..9fbb624f 100644
--- a/core/src/main/groovy/com/muwire/core/upload/HashListUploader.groovy
+++ b/core/src/main/groovy/com/muwire/core/upload/HashListUploader.groovy
@@ -45,7 +45,7 @@ class HashListUploader extends Uploader {
 
     @Override
     public synchronized int getProgress() {
-        (int)(mapped.position() * 100.0 / mapped.capacity())
+        (int)(mapped.position() * 100.0d / mapped.capacity())
     }
 
     @Override
diff --git a/core/src/main/groovy/com/muwire/core/upload/Uploader.groovy b/core/src/main/groovy/com/muwire/core/upload/Uploader.groovy
index 559aaa44..8d9ba3cf 100644
--- a/core/src/main/groovy/com/muwire/core/upload/Uploader.groovy
+++ b/core/src/main/groovy/com/muwire/core/upload/Uploader.groovy
@@ -49,7 +49,7 @@ abstract class Uploader {
         final long now = System.currentTimeMillis()
         long interval = Math.max(1000, now - lastSpeedRead)
         lastSpeedRead = now;
-        int currSpeed = (int) (dataSinceLastRead * 1000.0 / interval)
+        int currSpeed = (int) (dataSinceLastRead * 1000.0d / interval)
         dataSinceLastRead = 0
 
         // normalize to speedArr.size