diff --git a/lib/gen_print.py b/lib/gen_print.py
index ad06757..79e70d6 100755
--- a/lib/gen_print.py
+++ b/lib/gen_print.py
@@ -501,7 +501,7 @@
         if hex:
             if type(var_value) not in (int, long):
                 value_format = "%s"
-                if var_value is "":
+                if var_value == "":
                     var_value = "<blank>"
             else:
                 value_format = "0x%08x"