diff --git a/library/error.c b/library/error.c
index eabee9e21..3251af06c 100644
--- a/library/error.c
+++ b/library/error.c
@@ -865,6 +865,8 @@ void mbedtls_strerror( int ret, char *buf, size_t buflen )
 #if defined(MBEDTLS_SHA512_C)
     if( use_ret == -(MBEDTLS_ERR_SHA512_HW_ACCEL_FAILED) )
         mbedtls_snprintf( buf, buflen, "SHA512 - SHA-512 hardware accelerator failed" );
+    if( use_ret == -(MBEDTLS_ERR_SHA512_BAD_INPUT_DATA) )
+        mbedtls_snprintf( buf, buflen, "SHA512 - Invalid input data" );
 #endif /* MBEDTLS_SHA512_C */
 
 #if defined(MBEDTLS_THREADING_C)