diff --git a/src/cmd/yacc.c b/src/cmd/yacc.c
index c080e01..32990f6 100644
--- a/src/cmd/yacc.c
+++ b/src/cmd/yacc.c
@@ -2130,11 +2130,12 @@
 				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");