diff --git a/src/utils/fluid_settings.c b/src/utils/fluid_settings.c
index 3ba2c2e4..2d9f7b10 100644
--- a/src/utils/fluid_settings.c
+++ b/src/utils/fluid_settings.c
@@ -546,6 +546,7 @@ fluid_settings_register_str(fluid_settings_t *settings, const char *name, const
         if(node->type == FLUID_STR_TYPE)
         {
             fluid_str_setting_t *setting = &node->str;
+            FLUID_FREE(setting->def);
             setting->def = def ? FLUID_STRDUP(def) : NULL;
             setting->hints = hints;
             retval = FLUID_OK;