diff --git a/src/lib/controllib/BlockDelay.hpp b/src/lib/controllib/BlockDelay.hpp
index 686aec5e07..e6049b0ff9 100644
--- a/src/lib/controllib/BlockDelay.hpp
+++ b/src/lib/controllib/BlockDelay.hpp
@@ -76,7 +76,7 @@ public:
 		// delay starts at zero, then increases to LEN
 		_delay += 1;
 
-		if (_delay > (LEN - 1)) {
+		if (_delay > (int)(LEN - 1)) {
 			_delay = LEN - 1;
 		}