diff --git a/rtc_base/opensslsessioncache.h b/rtc_base/opensslsessioncache.h
index ee5b525334..c74b7bf820 100644
--- a/rtc_base/opensslsessioncache.h
+++ b/rtc_base/opensslsessioncache.h
@@ -18,6 +18,10 @@
 #include "rtc_base/constructormagic.h"
 #include "rtc_base/sslstreamadapter.h"
 
+#ifndef OPENSSL_IS_BORINGSSL
+typedef struct ssl_session_st SSL_SESSION;
+#endif
+
 namespace rtc {
 
 // The OpenSSLSessionCache maps hostnames to SSL_SESSIONS. This cache is