fix statistics class count
diff --git a/rpmalloc/rpmalloc.h b/rpmalloc/rpmalloc.h
index bfbdbde..03b6c05 100644
--- a/rpmalloc/rpmalloc.h
+++ b/rpmalloc/rpmalloc.h
@@ -111,7 +111,7 @@
 		size_t from_reserved;
 		//! Number of raw memory map calls (not hitting the reserve spans but resulting in actual OS mmap calls)
 		size_t map_calls;
-	} span_use[32];
+	} span_use[64];
 	//! Per size class statistics (only if ENABLE_STATISTICS=1)
 	struct {
 		//! Current number of allocations