diff --git a/src/editline.c b/src/editline.c
index ccb3ac2..77f2bfa 100644
--- a/src/editline.c
+++ b/src/editline.c
@@ -174,7 +174,7 @@ static void tty_put(const char c)
 	return;
 
     Screen[ScreenCount] = c;
-    if (++ScreenCount > ScreenSize) {
+    if (++ScreenCount >= ScreenSize) {
         ScreenSize += SCREEN_INC;
         Screen = realloc(Screen, sizeof(char) * ScreenSize);
     }