diff --git a/nemu/src/monitor/sdb/addrexp.y b/nemu/src/monitor/sdb/addrexp.y
index 584e12e..b2a9ad3 100644
--- a/nemu/src/monitor/sdb/addrexp.y
+++ b/nemu/src/monitor/sdb/addrexp.y
@@ -31,10 +31,10 @@ input
 
 expression
     : number { $$ = $1; }
-    | expression '=' '=' expression { $$ = ($1 == $3); }
-    | expression '!' '=' expression { $$ = ($1 == $3); }
     | expression '>' '=' expression { $$ = ($1 >= $3); }
     | expression '<' '=' expression { $$ = ($1 <= $3); }
+    | expression '=' '=' expression { $$ = ($1 == $3); }
+    | expression '!' '=' expression { $$ = ($1 == $3); }
     | expression '>' expression { $$ = ($1 > $3); }
     | expression '<' expression { $$ = ($1 < $3); }
     | expression '+' expression { $$ = $1 + $3; }