diff --git a/src/compiler/checker.ts b/src/compiler/checker.ts
index fe5a746a74df8..2d678afbf519a 100644
--- a/src/compiler/checker.ts
+++ b/src/compiler/checker.ts
@@ -6720,8 +6720,8 @@ namespace ts {
                     // Record a new minimum argument count if this is not an optional parameter
                     const isOptionalParameter = param.initializer || param.questionToken || param.dotDotDotToken ||
                         iife && parameters.length > iife.arguments.length && !param.type ||
-                        isJSDocOptionalParameter(param) ||
-                        isUntypedSignatureInJSFile;
+                        isUntypedSignatureInJSFile ||
+                        isJSDocOptionalParameter(param);
                     if (!isOptionalParameter) {
                         minArgumentCount = parameters.length;
                     }