diff --git a/src/misc.cpp b/src/misc.cpp
index 99c00ebe..13923a7b 100644
--- a/src/misc.cpp
+++ b/src/misc.cpp
@@ -61,7 +61,7 @@ const string engine_info(bool to_uci) {
 
 /// Debug functions used mainly to collect run-time statistics
 
-static uint64_t hits[2], means[2];
+static int64_t hits[2], means[2];
 
 void dbg_hit_on(bool b) { ++hits[0]; if (b) ++hits[1]; }
 void dbg_hit_on_c(bool c, bool b) { if (c) dbg_hit_on(b); }