diff --git a/ch1-basic/ch1-05-mem.md b/ch1-basic/ch1-05-mem.md
index 4e2cf95..b55ac10 100644
--- a/ch1-basic/ch1-05-mem.md
+++ b/ch1-basic/ch1-05-mem.md
@@ -96,7 +96,7 @@ var (
 )
 
 func Instance() *singleton {
-    if atomic.LoadUInt32(&initialized) == 1 {
+    if atomic.LoadUint32(&initialized) == 1 {
 		return instance
 	}