diff --git a/src/P2822/P2822_prefix.cpp b/src/P2822/P2822_prefix.cpp
index 94f597c..cd4d790 100644
--- a/src/P2822/P2822_prefix.cpp
+++ b/src/P2822/P2822_prefix.cpp
@@ -3,7 +3,7 @@
 
 using ull = unsigned long long;
 
-static constexpr size_t max_n {(size_t)2e3+5}; 
+static const size_t max_n {(size_t)2e3+5}; 
 static ull k, c[max_n][max_n], prefix[max_n][max_n], t, n, m;
 
 static void init(){