1 files changed, 2 insertions, 0 deletions
diff --git a/src/cmd/yacc.c b/src/cmd/yacc.c
index 32698c2a..bd3f6aa4 100644
--- a/src/cmd/yacc.c
+++ b/src/cmd/yacc.c
@@ -1805,6 +1805,8 @@ begin:
 			}
 		} else
 			return c;
+		if(c == Beof)
+			return ENDFILE;
 		Bungetrune(finput);
 	}
 	tokname[i] = 0;