diff --git a/src/cmd/9term/9term.c b/src/cmd/9term/9term.c
index 192a9bc..107afed 100644
--- a/src/cmd/9term/9term.c
+++ b/src/cmd/9term/9term.c
@@ -449,7 +449,8 @@
 }
 
 int
-intrc() {
+intrc(void)
+{
 	return getintr(sfd);
 }
 
diff --git a/src/cmd/9term/fns.h b/src/cmd/9term/fns.h
index 196f418..34cebf0 100644
--- a/src/cmd/9term/fns.h
+++ b/src/cmd/9term/fns.h
@@ -31,7 +31,7 @@
 int	goodrect(Rectangle);
 int	rawon(void);
 void	winterrupt(Window*);
-int	intrc();
+int	intrc(void);
 
 #define	runemalloc(n)		malloc((n)*sizeof(Rune))
 #define	runerealloc(a, n)	realloc(a, (n)*sizeof(Rune))