diff --git a/src/cli.mjs b/src/cli.mjs
index a62289c..cc58b04 100755
--- a/src/cli.mjs
+++ b/src/cli.mjs
@@ -37,8 +37,8 @@ if (positionals.length > 1) {
 }
 
 if (
-  !outfile.endsWith(".html") ||
-  !outfile.endsWith(".importmap") ||
+  !outfile.endsWith(".html") &&
+  !outfile.endsWith(".importmap") &&
   !outfile.endsWith(".json")
 ) {
   console.error("Error: outfile must end with .html, .importmap or .json");