diff --git a/Ghidra/Features/GhidraServer/src/main/java/ghidra/server/UserManager.java b/Ghidra/Features/GhidraServer/src/main/java/ghidra/server/UserManager.java
index c8ffde648d..aaca24b44e 100644
--- a/Ghidra/Features/GhidraServer/src/main/java/ghidra/server/UserManager.java
+++ b/Ghidra/Features/GhidraServer/src/main/java/ghidra/server/UserManager.java
@@ -752,7 +752,7 @@ public class UserManager {
 	 * Regex: matches if the entire string is alpha, digit, ".", "-", "_", fwd or back slash.
 	 */
 	private static final Pattern VALID_USERNAME_REGEX =
-		Pattern.compile("[a-zA-Z][a-zA-Z0-9.\\-_/\\\\]*");
+		Pattern.compile("[a-zA-Z0-9][a-zA-Z0-9.\\-_/\\\\]*");
 
 	/**
 	 * Ensures a name only contains valid characters and meets length limitations.