diff --git a/include/grpc/support/port_platform.h b/include/grpc/support/port_platform.h
index e73b9004d7fb0b818ee45f2ffb9332f74b32a4f2..4051d172fdedbfda8e6056d4cb7b8fe88a4f0926 100644
--- a/include/grpc/support/port_platform.h
+++ b/include/grpc/support/port_platform.h
@@ -163,6 +163,7 @@
 #endif
 #define GPR_CPU_POSIX 1
 #define GPR_GCC_ATOMIC 1
+#define GPR_GCC_TLS 1
 #define GPR_POSIX_LOG 1
 #define GPR_POSIX_MULTIPOLL_WITH_POLL 1
 #define GPR_POSIX_WAKEUP_FD 1