diff --git a/src/syncterm/ooii.c b/src/syncterm/ooii.c
index fbbbb31329f69c440be0f179627708de11a6e5f4..fd98742f95db3fdf85c346d143c8eac6024bcf56 100644
--- a/src/syncterm/ooii.c
+++ b/src/syncterm/ooii.c
@@ -1152,7 +1152,7 @@ readSmallMenu(unsigned char *codeStr)
 }
 
 static void
-checkStamp(int xx, int yy, char stampStr[20]) // used w/ incomingCheck
+checkStamp(int xx, int yy, char stampStr[]) // used w/ incomingCheck
 {
 	term_gotoxy(xx + 1, yy + 1);
 	term_setattr(LIGHTCYAN);