diff --git a/include/mbedtls/asn1.h b/include/mbedtls/asn1.h
index 6b79196..d2162fe 100644
--- a/include/mbedtls/asn1.h
+++ b/include/mbedtls/asn1.h
@@ -578,7 +578,7 @@
  *
  * \return      NULL if not found, or a pointer to the existing entry.
  */
-mbedtls_asn1_named_data *mbedtls_asn1_find_named_data( mbedtls_asn1_named_data *list,
+const mbedtls_asn1_named_data *mbedtls_asn1_find_named_data( const mbedtls_asn1_named_data *list,
                                        const char *oid, size_t len );
 
 /**
diff --git a/library/asn1parse.c b/library/asn1parse.c
index 22747d3..83c7c58 100644
--- a/library/asn1parse.c
+++ b/library/asn1parse.c
@@ -461,7 +461,7 @@
     }
 }
 
-mbedtls_asn1_named_data *mbedtls_asn1_find_named_data( mbedtls_asn1_named_data *list,
+const mbedtls_asn1_named_data *mbedtls_asn1_find_named_data( const mbedtls_asn1_named_data *list,
                                        const char *oid, size_t len )
 {
     while( list != NULL )
diff --git a/tests/suites/test_suite_asn1parse.function b/tests/suites/test_suite_asn1parse.function
index 990f343..4d179ea 100644
--- a/tests/suites/test_suite_asn1parse.function
+++ b/tests/suites/test_suite_asn1parse.function
@@ -718,7 +718,7 @@
     };
     mbedtls_asn1_named_data *pointers[ARRAY_LENGTH( nd ) + 1];
     size_t i;
-    mbedtls_asn1_named_data *found;
+    const mbedtls_asn1_named_data *found;
 
     for( i = 0; i < ARRAY_LENGTH( nd ); i++ )
         pointers[i] = &nd[i];
@@ -726,7 +726,7 @@
     for( i = 0; i < ARRAY_LENGTH( nd ); i++ )
         nd[i].next = pointers[i+1];
 
-    found = mbedtls_asn1_find_named_data( pointers[from],
+    found = mbedtls_asn1_find_named_data( (const mbedtls_asn1_named_data*) pointers[from],
                                           (const char *) needle->x,
                                           needle->len );
     TEST_ASSERT( found == pointers[position] );