diff --git a/base_3.md b/base_3.md
index 79ba40c504210444e836c2a94da1f9516917ce1f..f69d570ca2fce28c975f3f386e0db8b015f2e2e9 100644
--- a/base_3.md
+++ b/base_3.md
@@ -32,7 +32,7 @@
     ```C
     typedef unsinged int uint;
     typedef struct complex complex_t;
-    typedef struct _complex {
+    typedef struct complex {
         double re, im;
     } complex_t;
     ```