diff --git a/hw/xfree86/i2c/bt829.c b/hw/xfree86/i2c/bt829.c
index 070cb2044..991c26eab 100644
--- a/hw/xfree86/i2c/bt829.c
+++ b/hw/xfree86/i2c/bt829.c
@@ -500,6 +500,7 @@ bt829_Detect(I2CBusPtr b, I2CSlaveAddr addr)
 {
     BT829Ptr bt;
     I2CByte a;
+    char *devname;
 
     bt = calloc(1, sizeof(BT829Rec));
     if (bt == NULL)
@@ -520,31 +521,31 @@ bt829_Detect(I2CBusPtr b, I2CSlaveAddr addr)
 
     bt->id = btread(bt, IDCODE);
 
-    free(bt->d.DevName);
-    bt->d.DevName = calloc(200, sizeof(char));
+    free((void *) bt->d.DevName);
+    bt->d.DevName = devname = calloc(200, sizeof(char));
     switch (BTVERSION) {
     case BT815:
-        sprintf(bt->d.DevName, "bt815a video decoder, revision %d",
+        sprintf(devname, "bt815a video decoder, revision %d",
                 bt->id & 0xf);
         break;
     case BT817:
-        sprintf(bt->d.DevName, "bt817a video decoder, revision %d",
+        sprintf(devname, "bt817a video decoder, revision %d",
                 bt->id & 0xf);
         break;
     case BT819:
-        sprintf(bt->d.DevName, "bt819a video decoder, revision %d",
+        sprintf(devname, "bt819a video decoder, revision %d",
                 bt->id & 0xf);
         break;
     case BT827:
-        sprintf(bt->d.DevName, "bt827a/b video decoder, revision %d",
+        sprintf(devname, "bt827a/b video decoder, revision %d",
                 bt->id & 0xf);
         break;
     case BT829:
-        sprintf(bt->d.DevName, "bt829a/b video decoder, revision %d",
+        sprintf(devname, "bt829a/b video decoder, revision %d",
                 bt->id & 0xf);
         break;
     default:
-        sprintf(bt->d.DevName,
+        sprintf(devname,
                 "bt8xx/unknown video decoder version %d, revision %d",
                 bt->id >> 4, bt->id & 0xf);
         break;
diff --git a/hw/xfree86/i2c/msp3430.c b/hw/xfree86/i2c/msp3430.c
index 312a2d1d1..a501489ee 100644
--- a/hw/xfree86/i2c/msp3430.c
+++ b/hw/xfree86/i2c/msp3430.c
@@ -163,7 +163,7 @@ DetectMSP3430(I2CBusPtr b, I2CSlaveAddr addr)
     m->d.ByteTimeout = b->ByteTimeout;
 
     if (!I2C_WriteRead(&(m->d), NULL, 0, &a, 1)) {
-        free(m->d.DevName);
+        free((void *) m->d.DevName);
         free(m);
         return NULL;
     }
@@ -250,12 +250,12 @@ DetectMSP3430(I2CBusPtr b, I2CSlaveAddr addr)
                supported ? "" : " (unsupported)", rom_version, m->chip_id);
 
     if (!supported) {
-        free(m->d.DevName);
+        free((void *) m->d.DevName);
         free(m);
         return NULL;
     }
     if (!I2CDevInit(&(m->d))) {
-        free(m->d.DevName);
+        free((void *) m->d.DevName);
         free(m);
         return NULL;
     }
diff --git a/hw/xfree86/vbe/vbeModes.c b/hw/xfree86/vbe/vbeModes.c
index 415167d0e..40bd985ce 100644
--- a/hw/xfree86/vbe/vbeModes.c
+++ b/hw/xfree86/vbe/vbeModes.c
@@ -356,8 +356,10 @@ VBESetModeNames(DisplayModePtr pMode)
                 pMode->name = strdup("BADMODE");
             }
             else {
-                XNFasprintf(&pMode->name, "%dx%d",
+                char *tmp;
+                XNFasprintf(&tmp, "%dx%d",
                             pMode->HDisplay, pMode->VDisplay);
+                pMode->name = tmp;
             }
         }
         pMode = pMode->next;