diff --git a/src/core/lib/iomgr/port.h b/src/core/lib/iomgr/port.h
index 3e32429d41f..9888e8c04ba 100644
--- a/src/core/lib/iomgr/port.h
+++ b/src/core/lib/iomgr/port.h
@@ -73,9 +73,9 @@
 #if __GLIBC_PREREQ(2, 10)
 #define GRPC_LINUX_SOCKETUTILS 1
 #endif
-#if !(__GLIBC_PREREQ(2, 17))
+#if !(__GLIBC_PREREQ(2, 18))
 /*
- * TCP_USER_TIMEOUT wasn't imported to glibc until 2.17. Use Linux system
+ * TCP_USER_TIMEOUT wasn't imported to glibc until 2.18. Use Linux system
  * header instead.
  */
 #define GRPC_LINUX_TCP_H 1