diff --git a/src/core/tsi/alts/crypt/aes_gcm.cc b/src/core/tsi/alts/crypt/aes_gcm.cc
index 02b1ac4492..191f462277 100644
--- a/src/core/tsi/alts/crypt/aes_gcm.cc
+++ b/src/core/tsi/alts/crypt/aes_gcm.cc
@@ -26,6 +26,7 @@
 #include <openssl/evp.h>
 #include <openssl/hmac.h>
 #include <string.h>
+#include <cstdio>
 
 #include <grpc/support/alloc.h>