--- a/sys/src/cmd/yacc.c
+++ b/sys/src/cmd/yacc.c
@@ -2095,11 +2095,12 @@ swt:
 				c = Bgetrune(finput);
 				if(c == '\n')
 					lineno++;
-			} else
+			} else {
 				if(c == match)
 					goto lcopy;
 				if(c == '\n')
 					error("newline in string or char. const.");
+			}
 			Bputrune(faction, c);
 		}
 		error("EOF in string or character constant");