diff --git a/jtag/src/part/data_register.c b/jtag/src/part/data_register.c
index 40e40c2e..f7eb6a89 100644
--- a/jtag/src/part/data_register.c
+++ b/jtag/src/part/data_register.c
@@ -47,7 +47,7 @@ data_register_alloc( const char *name, int len )
 
 	dr->value = register_alloc( len );
 	dr->oldval = register_alloc( len );
-	if (!dr->value || dr->oldval) {
+	if (!dr->value || !dr->oldval) {
 		free( dr->value );
 		free( dr->oldval );
 		free( dr->name );