diff --git a/rai/node/rpc.cpp b/rai/node/rpc.cpp
index 1d32ade8..2d382d1d 100644
--- a/rai/node/rpc.cpp
+++ b/rai/node/rpc.cpp
@@ -4278,7 +4278,7 @@ void rai::rpc_connection::write_result (std::string body, unsigned version)
 	}
 	else
 	{
-		assert ("RPC already responded and should only respond once");
+		assert (false && "RPC already responded and should only respond once");
 		// Guards `res' from being clobbered while async_write is being serviced
 	}
 }