diff --git a/library/aes.c b/library/aes.c
index e4bcfa0..609f852 100644
--- a/library/aes.c
+++ b/library/aes.c
@@ -926,7 +926,7 @@
                           const unsigned char input[16],
                           unsigned char output[16] )
 {
-    mbedtls_internal_aes_encrypt( ctx, input, output );
+    MBEDTLS_IGNORE_RETURN( mbedtls_internal_aes_encrypt( ctx, input, output ) );
 }
 #endif /* !MBEDTLS_DEPRECATED_REMOVED */
 
@@ -999,7 +999,7 @@
                           const unsigned char input[16],
                           unsigned char output[16] )
 {
-    mbedtls_internal_aes_decrypt( ctx, input, output );
+    MBEDTLS_IGNORE_RETURN( mbedtls_internal_aes_decrypt( ctx, input, output ) );
 }
 #endif /* !MBEDTLS_DEPRECATED_REMOVED */