diff --git a/libm/libm.x86.map b/libm/libm.x86.map
index 3e259dd..550c39b 100644
--- a/libm/libm.x86.map
+++ b/libm/libm.x86.map
@@ -272,7 +272,7 @@
     *;
 };
 
-LIBC_O {
+LIBC_O { # introduced=O
   global:
     cacoshl;
     cacosl;