diff --git a/src/common.tsx b/src/common.tsx
index fb91924..c8c875a 100644
--- a/src/common.tsx
+++ b/src/common.tsx
@@ -289,7 +289,7 @@ export function ActionItem(p: { action: ActionInfo, identifierSubstring?: string
             const terminalContainer = document.getElementById('root');
             
             const terminal = new Terminal();
-            const fitAddon = new FitAddon();
+            const fitAddon = new FitAddon.FitAddon();
             terminal.loadAddon(fitAddon);
             terminal.open(terminalContainer);
             fitAddon.fit();