diff --git a/include/boost/charconv/detail/integer_search_trees.hpp b/include/boost/charconv/detail/integer_search_trees.hpp
index 41f23fb..f014567 100644
--- a/include/boost/charconv/detail/integer_search_trees.hpp
+++ b/include/boost/charconv/detail/integer_search_trees.hpp
@@ -157,9 +157,10 @@ BOOST_CXX14_CONSTEXPR int num_digits(std::uint64_t x) noexcept
 #ifdef __GLIBCXX_TYPE_INT_N_0
 static constexpr std::array<std::uint64_t, 20> powers_of_10 =
 {{
-    1, 10, 100, 1000, 10000, 100000, 1000000, 10000000, 100000000, 1000000000, 10000000000,
-    100000000000, 1000000000000, 10000000000000, 100000000000000, 1000000000000000, 10000000000000000,
-    100000000000000000, 1000000000000000000, 10000000000000000000
+    UINT64_C(1), UINT64_C(10), UINT64_C(100), UINT64_C(1000), UINT64_C(10000), UINT64_C(100000), UINT64_C(1000000), 
+    UINT64_C(10000000), UINT64_C(100000000), UINT64_C(1000000000), UINT64_C(10000000000), UINT64_C(100000000000), 
+    UINT64_C(1000000000000), UINT64_C(10000000000000), UINT64_C(100000000000000), UINT64_C(1000000000000000), 
+    UINT64_C(10000000000000000), UINT64_C(100000000000000000), UINT64_C(1000000000000000000), UINT64_C(10000000000000000000)
 }};
 
 // Assume that if someone is using 128 bit ints they are favoring the top end of the range