diff --git a/contrib/pnpinfo/pnpinfo.c b/contrib/pnpinfo/pnpinfo.c
--- a/contrib/pnpinfo/pnpinfo.c
+++ b/contrib/pnpinfo/pnpinfo.c
@@ -110,7 +110,7 @@
  * Intel May 94."
  */
 void
-send_Initiation_LFSR()
+send_Initiation_LFSR(void)
 {
     int cur, i;
 
@@ -189,8 +189,7 @@
 }
 
 void
-report_dma_info (x)
-	int x;
+report_dma_info(int x)
 {
     char *s1=NULL, *s2=NULL, *s3=NULL, *s4=NULL, *s5=NULL;
 
@@ -556,7 +555,7 @@
  *
  */
 int
-isolation_protocol()
+isolation_protocol(void)
 {
     int csn;
     u_char data[9];