diff --git a/services/wolf.sh b/services/wolf.sh
index 32ede95..3bda79f 100644
--- a/services/wolf.sh
+++ b/services/wolf.sh
@@ -966,12 +966,22 @@ UDEV
     if [[ "$_GET_TI99" =~ ^[Yy]$ ]]; then
         mkdir -p "$GAME_STORAGE_DIR/esde-custom-systems" "$GAME_STORAGE_DIR/roms/ti994a"
         local _TI99_XML="$GAME_STORAGE_DIR/esde-custom-systems/es_systems.xml"
-        if [ ! -f "$_TI99_XML" ] || ! grep -q '<name>ti994a</name>' "$_TI99_XML" 2>/dev/null; then
-            backup_if_exists "$_TI99_XML"
-            [ -f "$_TI99_XML" ] || echo '<systemList>' > "$_TI99_XML"
-            sed -i 's#</systemList>##' "$_TI99_XML" 2>/dev/null
-            cat >> "$_TI99_XML" << 'XMLEOF'
-    <system>
+        backup_if_exists "$_TI99_XML"
+        # Always strip and re-add the ti994a block rather than "skip if
+        # already present" — confirmed live: that check left a stale
+        # <command> line in place across a real fix to it, since existing
+        # was already "present" and the check never looked at whether its
+        # content matched the current template.
+        python3 - "$_TI99_XML" << 'TI99XMLPY'
+import re, sys
+path = sys.argv[1]
+try:
+    with open(path) as f:
+        content = f.read()
+except FileNotFoundError:
+    content = '<systemList>\n</systemList>\n'
+content = re.sub(r'[ \t]*<system>\s*<name>ti994a</name>.*?</system>\s*\n?', '', content, flags=re.DOTALL)
+block = '''    <system>
         <name>ti994a</name>
         <fullname>Texas Instruments TI-99/4A</fullname>
         <path>%ROMPATH%/ti994a</path>
@@ -980,13 +990,13 @@ UDEV
         <platform>ti99</platform>
         <theme>ti99</theme>
     </system>
-</systemList>
-XMLEOF
-            chown "$ACTUAL_USER:$ACTUAL_USER" "$_TI99_XML"
-            log_success "TI-99/4A added as an ES-DE system (roms/ti994a/, custom_systems/es_systems.xml)"
-        else
-            log_info "TI-99/4A system definition already present — left as-is."
-        fi
+'''
+content = content.replace('</systemList>', block + '</systemList>')
+with open(path, 'w') as f:
+    f.write(content)
+TI99XMLPY
+        chown "$ACTUAL_USER:$ACTUAL_USER" "$_TI99_XML"
+        log_success "TI-99/4A ES-DE system definition written/refreshed (roms/ti994a/, custom_systems/es_systems.xml)"
         echo ""
         if [ ! -x "$GAME_STORAGE_DIR/emulators/ti99sim-sdl" ]; then
             # Build inside a container running the EXACT SAME image ES-DE