diff --git a/libvncclient/hextile.c b/libvncclient/hextile.c
index 6f0d70b..8698445 100644
--- a/libvncclient/hextile.c
+++ b/libvncclient/hextile.c
@@ -55,7 +55,7 @@ HandleHextileBPP (rfbClient* client, int rx, int ry, int rw, int rh)
 	if (!ReadFromRFBServer(client, client->buffer, w * h * (BPP / 8)))
 	  return FALSE;
 
-	CopyRectangle(client, client->buffer, x, y, w, h);
+	CopyRectangle(client, (uint8_t *)client->buffer, x, y, w, h);
 
 	continue;
       }
diff --git a/libvncclient/tight.c b/libvncclient/tight.c
index f9cc946..2f9fbab 100644
--- a/libvncclient/tight.c
+++ b/libvncclient/tight.c
@@ -198,7 +198,7 @@ HandleTightBPP (rfbClient* client, int rx, int ry, int rw, int rh)
     buffer2 = &client->buffer[TIGHT_MIN_TO_COMPRESS * 4];
     filterFn(client, rh, (CARDBPP *)buffer2);
 
-    CopyRectangle(client, buffer2, rx, ry, rw, rh);
+    CopyRectangle(client, (uint8_t *)buffer2, rx, ry, rw, rh);
 
     return TRUE;
   }
@@ -277,7 +277,7 @@ HandleTightBPP (rfbClient* client, int rx, int ry, int rw, int rh)
       if (extraBytes > 0)
 	memcpy(client->buffer, &client->buffer[numRows * rowSize], extraBytes);
 
-      CopyRectangle(client, buffer2, rx, ry+rowsProcessed, rw, numRows);
+      CopyRectangle(client, (uint8_t *)buffer2, rx, ry+rowsProcessed, rw, numRows);
 
       rowsProcessed += numRows;
     }
@@ -577,7 +577,7 @@ DecompressJpegRectBPP(rfbClient* client, int x, int y, int w, int h)
       *pixelPtr++ =
 	RGB24_TO_PIXEL(BPP, client->buffer[dx*3], client->buffer[dx*3+1], client->buffer[dx*3+2]);
     }
-    CopyRectangle(client, &client->buffer[RFB_BUFFER_SIZE / 2], x, y + dy, w, 1);
+    CopyRectangle(client, (uint8_t *)&client->buffer[RFB_BUFFER_SIZE / 2], x, y + dy, w, 1);
     dy++;
   }
 
diff --git a/libvncclient/zlib.c b/libvncclient/zlib.c
index 89db504..e872d40 100644
--- a/libvncclient/zlib.c
+++ b/libvncclient/zlib.c
@@ -142,7 +142,7 @@ HandleZlibBPP (rfbClient* client, int rx, int ry, int rw, int rh)
   if ( inflateResult == Z_OK ) {
 
     /* Put the uncompressed contents of the update on the screen. */
-    CopyRectangle(client, client->raw_buffer, rx, ry, rw, rh);
+    CopyRectangle(client, (uint8_t *)client->raw_buffer, rx, ry, rw, rh);
   }
   else {