diff --git a/typer/_completion_classes.py b/typer/_completion_classes.py
index 71ba031860..f0bb89c3cc 100644
--- a/typer/_completion_classes.py
+++ b/typer/_completion_classes.py
@@ -86,6 +86,7 @@ def escape(s: str) -> str:
                 .replace("'", "''")
                 .replace("$", "\\$")
                 .replace("`", "\\`")
+                .replace(":", r"\\:")
             )
 
         # TODO: Explore replicating the new behavior from Click, pay attention to