diff --git a/src/util/depth.h b/src/util/depth.h
index 29ff2819..977fd0c3 100644
--- a/src/util/depth.h
+++ b/src/util/depth.h
@@ -183,7 +183,7 @@ public:
 
         s64a rv = val + d;
         if (rv < 0 || (u64a)rv >= val_infinity) {
-            DEBUG_PRINTF("depth %llu too large to represent!\n", rv);
+            DEBUG_PRINTF("depth %lld too large to represent!\n", rv);
             throw DepthOverflowError();
         }