diff --git a/board/esd/pci405/pci405.c b/board/esd/pci405/pci405.c
index 44bfe10..05f59a8 100644
--- a/board/esd/pci405/pci405.c
+++ b/board/esd/pci405/pci405.c
@@ -50,7 +50,7 @@
 
 
 /* Prototypes */
-int gunzip(void *, int, unsigned char *, int *);
+int gunzip(void *, int, unsigned char *, unsigned long *);
 
 
 int board_early_init_f (void)
@@ -116,7 +116,7 @@
 	 */
 
 	dst = malloc(CFG_FPGA_MAX_SIZE);
-	if (gunzip (dst, CFG_FPGA_MAX_SIZE, (uchar *)fpgadata, (int *)&len) != 0) {
+	if (gunzip (dst, CFG_FPGA_MAX_SIZE, (uchar *)fpgadata, &len) != 0) {
 		printf ("GUNZIP ERROR - must RESET board to recover\n");
 		do_reset (NULL, 0, 0, NULL);
 	}