diff --git a/pages/common/st-util.md b/pages/common/st-util.md
index 2183ef75b0..4cef470cd2 100644
--- a/pages/common/st-util.md
+++ b/pages/common/st-util.md
@@ -8,7 +8,7 @@
 
 - Connect to GDB server:
 
-`(gdb) target extended-remote {{localhost}}:4500`
+`(gdb) target extended-remote {{localhost}}:{{4500}}`
 
 - Write firmware to device: