diff --git a/crypto/bio/bio.c b/crypto/bio/bio.c
index 4b5bb720..8f8a1969 100644
--- a/crypto/bio/bio.c
+++ b/crypto/bio/bio.c
@@ -243,6 +243,10 @@ int BIO_reset(BIO *bio) {
   return BIO_ctrl(bio, BIO_CTRL_RESET, 0, NULL);
 }
 
+int BIO_eof(BIO *bio) {
+  return BIO_ctrl(bio, BIO_CTRL_EOF, 0, NULL);
+}
+
 void BIO_set_flags(BIO *bio, int flags) {
   bio->flags |= flags;
 }
diff --git a/include/openssl/bio.h b/include/openssl/bio.h
index 41c30caa..6524371f 100644
--- a/include/openssl/bio.h
+++ b/include/openssl/bio.h
@@ -152,6 +152,11 @@ OPENSSL_EXPORT long BIO_int_ctrl(BIO *bp, int cmd, long larg, int iarg);
  * otherwise. */
 OPENSSL_EXPORT int BIO_reset(BIO *bio);
 
+/* BIO_eof returns non-zero when |bio| has reached end-of-file. The precise
+ * meaning of which depends on the concrete type of |bio|. Note that in the
+ * case of BIO_pair this always returns non-zero. */
+OPENSSL_EXPORT int BIO_eof(BIO *bio);
+
 /* BIO_set_flags ORs |flags| with |bio->flags|. */
 OPENSSL_EXPORT void BIO_set_flags(BIO *bio, int flags);