diff --git a/ebml/EbmlElement.h b/ebml/EbmlElement.h
index a04a7b9b..2adb9bf9 100644
--- a/ebml/EbmlElement.h
+++ b/ebml/EbmlElement.h
@@ -538,7 +538,7 @@ class EBML_DLL_API EbmlSemanticContextMaster : public EbmlSemanticContext {
         const EbmlSemantic *MyTable; ///< First element in the table
 };
 
-static inline const EbmlSemantic & tEBML_CTX_IDX(const EbmlSemanticContextMaster & c, std::size_t i)
+static inline constexpr const EbmlSemantic & tEBML_CTX_IDX(const EbmlSemanticContextMaster & c, std::size_t i)
 {
   return c.GetSemantic(i);
 }