diff --git a/http2.d b/http2.d
index 4d71c20..82c45fb 100644
--- a/http2.d
+++ b/http2.d
@@ -663,7 +663,7 @@ class HttpRequest {
 							}
 						break;
 						case 2: // reading data
-							auto can = a + bodyReadingState.contentLengthRemaining;
+							size_t can = a + bodyReadingState.contentLengthRemaining;
 							if(can > data.length)
 								can = data.length;