diff --git a/src/cmd/samterm/main.c b/src/cmd/samterm/main.c
index 647696f7..9a485b51 100644
--- a/src/cmd/samterm/main.c
+++ b/src/cmd/samterm/main.c
@@ -443,7 +443,7 @@ flushtyping(int clearesc)
 #define RIGHTARROW	Kright
 
 int
-nontypingkey(c)
+nontypingkey(int c)
 {
 	return c==SCROLLKEY || c==BACKSCROLLKEY
 		|| c==LEFTARROW || c==RIGHTARROW