diff --git a/library/gcm.c b/library/gcm.c
index aaacf97..f1210c5 100644
--- a/library/gcm.c
+++ b/library/gcm.c
@@ -415,8 +415,7 @@
     if( tag_len > 16 || tag_len < 4 )
         return( MBEDTLS_ERR_GCM_BAD_INPUT );
 
-    if( tag_len != 0 )
-        memcpy( tag, ctx->base_ectr, tag_len );
+    memcpy( tag, ctx->base_ectr, tag_len );
 
     if( orig_len || orig_add_len )
     {