diff --git a/include/mbedtls/x509_crt.h b/include/mbedtls/x509_crt.h
index e90f6a0..aa0ec97 100644
--- a/include/mbedtls/x509_crt.h
+++ b/include/mbedtls/x509_crt.h
@@ -214,6 +214,8 @@
 mbedtls_x509write_cert;
 #endif /* MBEDTLS_X509_CRT_WRITE_C */
 
+#if !defined(MBEDTLS_X509_REMOVE_VERIFY_CALLBACK)
+
 /**
  * Item in a verification chain: cert and flags for it
  */
@@ -236,6 +238,16 @@
     unsigned len;
 } mbedtls_x509_crt_verify_chain;
 
+#else /* !MBEDTLS_X509_REMOVE_VERIFY_CALLBACK */
+
+typedef struct
+{
+    unsigned len;
+    uint32_t flags;
+} mbedtls_x509_crt_verify_chain;
+
+#endif /* !MBEDTLS_X509_REMOVE_VERIFY_CALLBACK */
+
 #if defined(MBEDTLS_ECDSA_C) && defined(MBEDTLS_ECP_RESTARTABLE)
 
 /**
diff --git a/library/x509_crt.c b/library/x509_crt.c
index a04e33c..5f2af7f 100644
--- a/library/x509_crt.c
+++ b/library/x509_crt.c
@@ -3185,6 +3185,8 @@
     return( -1 );
 }
 
+#if !defined(MBEDTLS_X509_REMOVE_VERIFY_CALLBACK)
+
 /*
  * Reset (init or clear) a verify_chain
  */
@@ -3261,6 +3263,62 @@
     return( chain->len );
 }
 
+#else
+
+/*
+ * Reset (init or clear) a verify_chain
+ */
+static void x509_crt_verify_chain_reset(
+    mbedtls_x509_crt_verify_chain *ver_chain )
+{
+    ver_chain->len   = 0;
+    ver_chain->flags = 0;
+}
+
+/*
+ * Merge the flags for all certs in the chain, after calling callback
+ */
+static int x509_crt_verify_chain_get_flags(
+           const mbedtls_x509_crt_verify_chain *ver_chain,
+           uint32_t *flags,
+           int (*f_vrfy)(void *, mbedtls_x509_crt *, int, uint32_t *),
+           void *p_vrfy )
+{
+    ((void) f_vrfy);
+    ((void) p_vrfy);
+    *flags = ver_chain->flags;
+    return( 0 );
+}
+
+static void x509_crt_verify_chain_add_ee_flags(
+    mbedtls_x509_crt_verify_chain *chain,
+    uint32_t ee_flags )
+{
+    chain->flags |= ee_flags;
+}
+
+static void x509_crt_verify_chain_add_crt(
+    mbedtls_x509_crt_verify_chain *chain,
+    mbedtls_x509_crt *crt )
+{
+    ((void) crt);
+    chain->len++;
+}
+
+static uint32_t* x509_crt_verify_chain_get_cur_flags(
+    mbedtls_x509_crt_verify_chain *chain )
+{
+    return( &chain->flags );
+}
+
+static unsigned x509_crt_verify_chain_len(
+    mbedtls_x509_crt_verify_chain const *chain )
+{
+    return( chain->len );
+}
+
+#endif /* MBEDTLS_X509_REMOVE_VERIFY_CALLBACK */
+
 /*
  * Build and verify a certificate chain
  *