diff --git a/sbin/rcorder/rcorder.c b/sbin/rcorder/rcorder.c
index efcb7e261fdb..a8d4f4fdc3e1 100644
--- a/sbin/rcorder/rcorder.c
+++ b/sbin/rcorder/rcorder.c
@@ -990,7 +990,7 @@ do_file(filenode *fnode, strnodelist *stack_ptr)
 }
 
 static void
-generate_graphviz_header()
+generate_graphviz_header(void)
 {
 
 	if (do_graphviz != true)
@@ -1003,7 +1003,7 @@ generate_graphviz_header()
 }
 
 static void
-generate_graphviz_footer()
+generate_graphviz_footer(void)
 {
 
 	if (do_graphviz == true)
@@ -1011,7 +1011,7 @@ generate_graphviz_footer()
 }
 
 static void
-generate_graphviz_providers()
+generate_graphviz_providers(void)
 {
 	Hash_Entry *entry;
 	Hash_Search psearch;
diff --git a/usr.sbin/crunch/crunchgen/crunched_main.c b/usr.sbin/crunch/crunchgen/crunched_main.c
index d32589451260..1b9ff1708538 100644
--- a/usr.sbin/crunch/crunchgen/crunched_main.c
+++ b/usr.sbin/crunch/crunchgen/crunched_main.c
@@ -183,7 +183,7 @@ crunched_main(int argc, char **argv, char **envp)
 }
 
 static void
-crunched_usage()
+crunched_usage(void)
 {
 	int columns, len;
 	struct stub *ep;