diff --git a/include/nlohmann/detail/conversions/to_chars.hpp b/include/nlohmann/detail/conversions/to_chars.hpp
index c0945ab9e..52342db40 100644
--- a/include/nlohmann/detail/conversions/to_chars.hpp
+++ b/include/nlohmann/detail/conversions/to_chars.hpp
@@ -308,8 +308,8 @@ boundaries compute_boundaries(FloatType value)
 //
 //      -e <= 60   or   e >= -60 := alpha
 
-constexpr int kAlpha = -60;
-constexpr int kGamma = -32;
+JSON_INLINE_VARIABLE constexpr int kAlpha = -60;
+JSON_INLINE_VARIABLE constexpr int kGamma = -32;
 
 struct cached_power // c = f * 2^e ~= 10^k
 {
diff --git a/single_include/nlohmann/json.hpp b/single_include/nlohmann/json.hpp
index 9f5890332..6640c3da9 100644
--- a/single_include/nlohmann/json.hpp
+++ b/single_include/nlohmann/json.hpp
@@ -26651,8 +26651,8 @@ boundaries compute_boundaries(FloatType value)
 //
 //      -e <= 60   or   e >= -60 := alpha
 
-constexpr int kAlpha = -60;
-constexpr int kGamma = -32;
+JSON_INLINE_VARIABLE constexpr int kAlpha = -60;
+JSON_INLINE_VARIABLE constexpr int kGamma = -32;
 
 struct cached_power // c = f * 2^e ~= 10^k
 {