diff --git a/features_cpp26.yaml b/features_cpp26.yaml
index b98a636..90a237f 100644
--- a/features_cpp26.yaml
+++ b/features_cpp26.yaml
@@ -245,7 +245,7 @@ features:
     lib: true
     support: [GCC 14]
     ftm:
-      - name: _cpp_lib_text_encoding
+      - name: __cpp_lib_text_encoding
         value: 202306L
 
   - desc: "`std::function_ref`: type-erased callable reference"