diff --git a/test/test_uzlib_gzip_wrapper/decompress.cpp b/test/test_uzlib_gzip_wrapper/decompress.cpp
index be2b5b1..e538622 100644
--- a/test/test_uzlib_gzip_wrapper/decompress.cpp
+++ b/test/test_uzlib_gzip_wrapper/decompress.cpp
@@ -25,7 +25,7 @@ const std::mt19937::result_type RANDOM_SEED = 1685018244;
 /**
  * The characters to be used as part of the generated random data.
  */
-const char RANDOM_CHARS[] =
+constexpr char RANDOM_CHARS[] =
 		"0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ";
 
 /**