diff --git a/config/libc/eglibc.in b/config/libc/eglibc.in
index bcda3384..72ef1f25 100644
--- a/config/libc/eglibc.in
+++ b/config/libc/eglibc.in
@@ -18,19 +18,23 @@ choice
 
 config EGLIBC_V_2_5
     bool
-    prompt "2.5"
+    prompt "2_5"
 
 config EGLIBC_V_2_6
     bool
-    prompt "2.6"
+    prompt "2_6"
 
 config EGLIBC_V_2_7
     bool
-    prompt "2.7"
+    prompt "2_7"
 
 config EGLIBC_V_2_8
     bool
-    prompt "2.8"
+    prompt "2_8"
+
+config LIBC_V_2_9
+    bool
+    prompt "2_9"
 
 # CT_INSERT_VERSION_ABOVE
 # Don't remove above line!
@@ -50,6 +54,7 @@ config LIBC_VERSION
     default "2_6" if EGLIBC_V_2_6
     default "2_7" if EGLIBC_V_2_7
     default "2_8" if EGLIBC_V_2_8
+    default "2_9" if LIBC_V_2_9
 # CT_INSERT_VERSION_STRING_ABOVE
 # Don't remove above line!