diff --git a/hw/mips_jazz.c b/hw/mips_jazz.c
index 9578f28a48..3ff367d5c9 100644
--- a/hw/mips_jazz.c
+++ b/hw/mips_jazz.c
@@ -209,7 +209,7 @@ void mips_jazz_init (ram_addr_t ram_size,
     for (n = 0; n < nb_nics; n++) {
         nd = &nd_table[n];
         if (!nd->model)
-            nd->model = "dp83932";
+            nd->model = qemu_strdup("dp83932");
         if (strcmp(nd->model, "dp83932") == 0) {
             dp83932_init(nd, 0x80001000, 2, rc4030[4],
                          rc4030_opaque, rc4030_dma_memory_rw);
diff --git a/hw/ppc_prep.c b/hw/ppc_prep.c
index 104874f2f8..e674e454bd 100644
--- a/hw/ppc_prep.c
+++ b/hw/ppc_prep.c
@@ -692,7 +692,7 @@ static void ppc_prep_init (ram_addr_t ram_size,
         nb_nics1 = NE2000_NB_MAX;
     for(i = 0; i < nb_nics1; i++) {
         if (nd_table[i].model == NULL) {
-	    nd_table[i].model = "ne2k_isa";
+	    nd_table[i].model = qemu_strdup("ne2k_isa");
         }
         if (strcmp(nd_table[i].model, "ne2k_isa") == 0) {
             isa_ne2000_init(ne2000_io[i], ne2000_irq[i], &nd_table[i]);
diff --git a/net.c b/net.c
index f2b954c4ff..76e44c9c98 100644
--- a/net.c
+++ b/net.c
@@ -2813,10 +2813,10 @@ void net_client_uninit(NICInfo *nd)
     nd->vlan->nb_guest_devs--;
     nb_nics--;
 
-    qemu_free((void *)nd->model);
-    qemu_free((void *)nd->name);
-    qemu_free((void *)nd->devaddr);
-    qemu_free((void *)nd->id);
+    qemu_free(nd->model);
+    qemu_free(nd->name);
+    qemu_free(nd->devaddr);
+    qemu_free(nd->id);
 
     memset(nd, 0, sizeof(*nd));
 }
diff --git a/net.h b/net.h
index dfce8d6518..a36df45acc 100644
--- a/net.h
+++ b/net.h
@@ -95,10 +95,10 @@ enum {
 
 struct NICInfo {
     uint8_t macaddr[6];
-    const char *model;
-    const char *name;
-    const char *devaddr;
-    const char *id;
+    char *model;
+    char *name;
+    char *devaddr;
+    char *id;
     VLANState *vlan;
     VLANClientState *vc;
     void *private;