diff --git a/backend/code.c b/backend/code.c
index d85276f7..3fd2837e 100644
--- a/backend/code.c
+++ b/backend/code.c
@@ -383,7 +383,7 @@ int c93(struct zint_symbol *symbol, unsigned char source[])
 	error_number = 0;
 	strcpy(dest, "");
 
-	strcpy(local_source, (char *) source);
+	ustrcpy(local_source, source);
 	
 	if(ustrlen(local_source) > 45) {
 		/* This stops rediculously long input - the actual length of the barcode