diff --git a/src/chipset/sis_5513_p2i.c b/src/chipset/sis_5513_p2i.c
index d0c423a8e..ef9a6746d 100644
--- a/src/chipset/sis_5513_p2i.c
+++ b/src/chipset/sis_5513_p2i.c
@@ -1197,7 +1197,8 @@ sis_5513_pci_to_isa_close(void *priv)
     sis_5513_pci_to_isa_t *dev = (sis_5513_pci_to_isa_t *) priv;
     FILE      *fp  = NULL;
 
-    fp = nvr_fopen(dev->fn, "wb");
+    if (dev->fn != NULL)
+        fp = nvr_fopen(dev->fn, "wb");
 
     if (fp != NULL) {
         (void) fwrite(dev->apc_regs, 256, 1, fp);
diff --git a/src/chipset/sis_5581.c b/src/chipset/sis_5581.c
index 98b37897c..e2308c2d9 100644
--- a/src/chipset/sis_5581.c
+++ b/src/chipset/sis_5581.c
@@ -43,7 +43,6 @@
 #include <86box/sis_55xx.h>
 #include <86box/chipset.h>
 
-#define ENABLE_SIS_5581_LOG 1
 #ifdef ENABLE_SIS_5581_LOG
 int sis_5581_do_log = ENABLE_SIS_5581_LOG;