diff --git a/src/parser.c b/src/parser.c
index b18f659ab7189b9bf355240189492b7c25f3f647..01c0c87eaa7ddc8d66cb8d75063a2790b6b5d56b 100644
--- a/src/parser.c
+++ b/src/parser.c
@@ -750,7 +750,7 @@ void parser_get_opt_param_string(struct swift_params *params, const char *name,
       strcpy(retParam, params->data[i].value);
 
       /* Ensure same behavior if called multiple times for same parameter */
-      if (params->data[i].is_default && !strcmp(def, retParam))
+      if (params->data[i].is_default && strcmp(def, retParam) != 0)
         error(
             "Tried parsing %s again but cannot parse a parameter with "
             "two different default value ('%s' != '%s')",