diff --git a/nemu/src/monitor/sdb/addrexp.y b/nemu/src/monitor/sdb/addrexp.y
index 6aadc7a..9e296ba 100644
--- a/nemu/src/monitor/sdb/addrexp.y
+++ b/nemu/src/monitor/sdb/addrexp.y
@@ -1,16 +1,21 @@
-%{
+%code requires {
+    #include <common.h>
     #include <stdio.h>
     #include <stdlib.h>
-    #include <stdint.h>
     extern int yylex(void);
-    void yyerror(uint32_t *result, const char *err) {
+}
+%{
+    #include <common.h>
+    #include <stdio.h>
+    #include <stdlib.h>
+    void yyerror(word_t *result, const char *err) {
       fprintf(stderr, "Error: %s\n", err);
     }
 %}
 
 %token NUMBER HEX_NUMBER
 %start input
-%define api.value.type { uint32_t }
+%define api.value.type { word_t }
 %parse-param { uint32_t *result }
 %left '-' '+'
 %left '*' '/'
diff --git a/nemu/tests/Makefile b/nemu/tests/Makefile
index 7709a27..6804b41 100644
--- a/nemu/tests/Makefile
+++ b/nemu/tests/Makefile
@@ -1,4 +1,5 @@
 TEST_SRCS += tests/expr_test.c
+YACC = bison
 
 $(OBJ_DIR)/%: %.c $(TEST_OBJS) app
 	@mkdir -p $(dir $@)