diff --git a/library/x509_crl.c b/library/x509_crl.c
index 00f8545..8ff1be8 100644
--- a/library/x509_crl.c
+++ b/library/x509_crl.c
@@ -35,6 +35,8 @@
 #include MBEDTLS_CONFIG_FILE
 #endif
 
+#include "mbedtls/error.h"
+
 #if defined(MBEDTLS_X509_CRL_PARSE_C)
 
 #include "mbedtls/x509_crl.h"
@@ -74,7 +76,7 @@
                              const unsigned char *end,
                              int *ver )
 {
-    int ret;
+    int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
 
     if( ( ret = mbedtls_asn1_get_int( p, end, ver ) ) != 0 )
     {
@@ -101,7 +103,7 @@
                              const unsigned char *end,
                              mbedtls_x509_buf *ext )
 {
-    int ret;
+    int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
 
     if( *p == end )
         return( 0 );
@@ -181,7 +183,7 @@
                              const unsigned char *end,
                              mbedtls_x509_buf *ext )
 {
-    int ret;
+    int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
     size_t len = 0;
 
     /* OPTIONAL */
@@ -235,7 +237,7 @@
                              const unsigned char *end,
                              mbedtls_x509_crl_entry *entry )
 {
-    int ret;
+    int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
     size_t entry_len;
     mbedtls_x509_crl_entry *cur_entry = entry;
 
@@ -300,7 +302,7 @@
 int mbedtls_x509_crl_parse_der( mbedtls_x509_crl *chain,
                         const unsigned char *buf, size_t buflen )
 {
-    int ret;
+    int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
     size_t len;
     unsigned char *p = NULL, *end = NULL;
     mbedtls_x509_buf sig_params1, sig_params2, sig_oid2;
@@ -539,7 +541,7 @@
 int mbedtls_x509_crl_parse( mbedtls_x509_crl *chain, const unsigned char *buf, size_t buflen )
 {
 #if defined(MBEDTLS_PEM_PARSE_C)
-    int ret;
+    int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
     size_t use_len;
     mbedtls_pem_context pem;
     int is_pem = 0;
@@ -603,7 +605,7 @@
  */
 int mbedtls_x509_crl_parse_file( mbedtls_x509_crl *chain, const char *path )
 {
-    int ret;
+    int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
     size_t n;
     unsigned char *buf;
 
@@ -630,7 +632,7 @@
 int mbedtls_x509_crl_info( char *buf, size_t size, const char *prefix,
                    const mbedtls_x509_crl *crl )
 {
-    int ret;
+    int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
     size_t n;
     char *p;
     const mbedtls_x509_crl_entry *entry;