diff --git a/project/src/net/curl/CURLBindings.cpp b/project/src/net/curl/CURLBindings.cpp
index 2bbb095ea7..861bb8536f 100644
--- a/project/src/net/curl/CURLBindings.cpp
+++ b/project/src/net/curl/CURLBindings.cpp
@@ -718,7 +718,8 @@ namespace lime {
 					pos->v.i = position;
 
 					curl_gc_mutex.Unlock ();
-					length = *((int*)writeCallback->Call (bytes, pos));
+					vdynamic* _length = (vdynamic*)writeCallback->Call (bytes, pos);
+					length = (_length != NULL ? _length->v.i : 0);
 					curl_gc_mutex.Lock ();
 
 					if (length == CURL_WRITEFUNC_PAUSE) {
@@ -749,7 +750,8 @@ namespace lime {
 			ulnow->v.d = progress->ulnow;
 
 			curl_gc_mutex.Unlock ();
-			code = *((int*)progressCallback->Call (dltotal, dlnow, ultotal, ulnow));
+			vdynamic* _code = (vdynamic*)progressCallback->Call (dltotal, dlnow, ultotal, ulnow);
+			code = (_code != NULL ? _code->v.i : 0);
 			curl_gc_mutex.Lock ();
 
 			if (code != 0) { // CURLE_OK
@@ -776,7 +778,8 @@ namespace lime {
 			ulnow->v.i = xferInfo->ulnow;
 
 			curl_gc_mutex.Unlock ();
-			code = *((int*)xferInfoCallback->Call (dltotal, dlnow, ultotal, ulnow));
+			vdynamic* _code = (vdynamic*)xferInfoCallback->Call (dltotal, dlnow, ultotal, ulnow);
+			code = (_code != NULL ? _code->v.i : 0);
 			curl_gc_mutex.Lock ();
 
 			if (code != 0) {
@@ -1706,7 +1709,7 @@ namespace lime {
 
 				}
 
-				progressCallbacks[handle] = new ValuePointer (parameter);;
+				progressCallbacks[handle] = new ValuePointer (parameter);
 				progressValues[handle] = new CURL_Progress ();
 
 				code = curl_easy_setopt (easy_handle, type, progress_callback);
diff --git a/src/lime/_internal/backend/native/NativeHTTPRequest.hx b/src/lime/_internal/backend/native/NativeHTTPRequest.hx
index f5ecea072d..026d23f963 100644
--- a/src/lime/_internal/backend/native/NativeHTTPRequest.hx
+++ b/src/lime/_internal/backend/native/NativeHTTPRequest.hx
@@ -377,7 +377,7 @@ class NativeHTTPRequest
 		}
 	}
 
-	private function curl_onProgress(curl:CURL, dltotal:Float, dlnow:Float, uptotal:Float, upnow:Float):Void
+	private function curl_onProgress(curl:CURL, dltotal:Float, dlnow:Float, uptotal:Float, upnow:Float):Int
 	{
 		if (upnow > writeBytesLoaded || dlnow > writeBytesLoaded || uptotal > writeBytesTotal || dltotal > writeBytesTotal)
 		{
@@ -389,6 +389,8 @@ class NativeHTTPRequest
 			// Wrong thread
 			// promise.progress (bytesLoaded, bytesTotal);
 		}
+
+		return 0;
 	}
 
 	private function curl_onWrite(curl:CURL, output:Bytes):Int