diff --git a/props/detonator.h b/props/detonator.h
index 56aad2f7e..eb7cf054c 100644
--- a/props/detonator.h
+++ b/props/detonator.h
@@ -14,7 +14,7 @@ class Detonator : public PROP_INHERIT_PREFIX PropBase {
   bool powered_ = false;
   void SetPower(bool on) { powered_ = on; }
 #else
-  constexpr bool powered_ = true;
+  bool powered_ = true;
   void SetPower(bool on) {}
 #endif