diff --git a/include/toml11/impl/format_impl.hpp b/include/toml11/impl/format_impl.hpp
index c0c60267..c4985faf 100644
--- a/include/toml11/impl/format_impl.hpp
+++ b/include/toml11/impl/format_impl.hpp
@@ -267,7 +267,7 @@ TOML11_INLINE std::ostream& operator<<(std::ostream& os, const table_format f)
         case table_format::implicit         : {os << "implicit"         ; break;}
         default:
         {
-            os << "unknown array_format: " << static_cast<std::uint8_t>(f);
+            os << "unknown table_format: " << static_cast<std::uint8_t>(f);
             break;
         }
     }
diff --git a/single_include/toml.hpp b/single_include/toml.hpp
index 89b5f1d6..8e19e88d 100644
--- a/single_include/toml.hpp
+++ b/single_include/toml.hpp
@@ -641,7 +641,7 @@ TOML11_INLINE std::ostream& operator<<(std::ostream& os, const table_format f)
         case table_format::implicit         : {os << "implicit"         ; break;}
         default:
         {
-            os << "unknown array_format: " << static_cast<std::uint8_t>(f);
+            os << "unknown table_format: " << static_cast<std::uint8_t>(f);
             break;
         }
     }