diff --git a/contrib/c-blosc/utils/utils_blosc.cc b/contrib/c-blosc/utils/utils_blosc.cc
index 88f1bef..99289ee 100644
--- a/contrib/c-blosc/utils/utils_blosc.cc
+++ b/contrib/c-blosc/utils/utils_blosc.cc
@@ -20,7 +20,7 @@
 
 #include "contrib/c-blosc/sandboxed.h"
 
-static const size_t kFileMaxSize = 1024 * 1024 * 1024;  // 1GB
+constexpr size_t kFileMaxSize = 1024 * 1024 * 1024;  // 1GB
 
 std::streamsize GetStreamSize(std::ifstream& stream) {
   stream.seekg(0, std::ios_base::end);
diff --git a/contrib/zstd/utils/utils_zstd.cc b/contrib/zstd/utils/utils_zstd.cc
index 393f7b9..b32b10d 100644
--- a/contrib/zstd/utils/utils_zstd.cc
+++ b/contrib/zstd/utils/utils_zstd.cc
@@ -18,7 +18,7 @@
 
 #include "contrib/zstd/sandboxed.h"
 
-static const size_t kFileMaxSize = 1024 * 1024 * 1024;  // 1GB
+constexpr size_t kFileMaxSize = 1024 * 1024 * 1024;  // 1GB
 
 std::streamsize GetStreamSize(std::ifstream& stream) {
   stream.seekg(0, std::ios_base::end);