diff --git a/panda/src/pgraph/cacheStats.h b/panda/src/pgraph/cacheStats.h
index 2812bbed4e..b415843e34 100644
--- a/panda/src/pgraph/cacheStats.h
+++ b/panda/src/pgraph/cacheStats.h
@@ -25,7 +25,7 @@
  */
 class EXPCL_PANDA_PGRAPH CacheStats {
 public:
-  CacheStats() = default;
+  constexpr CacheStats() = default;
   void init();
   void reset(double now);
   void write(std::ostream &out, const char *name) const;