diff --git a/src/compiler/checker.ts b/src/compiler/checker.ts
index 6b49b0bdb93..88f4b1bfe6b 100644
--- a/src/compiler/checker.ts
+++ b/src/compiler/checker.ts
@@ -5226,7 +5226,7 @@ namespace ts {
                 let hasThisParameter: boolean;
                 const iife = getImmediatelyInvokedFunctionExpression(declaration);
                 const isJSConstructSignature = isJSDocConstructSignature(declaration);
-                const isUntypedSignatureInJSFile = !iife && !isJSConstructSignature && isInJavaScriptFile(declaration);
+                const isUntypedSignatureInJSFile = !iife && !isJSConstructSignature && isInJavaScriptFile(declaration) && !hasJSDocParamterTags(declaration);
 
                 // If this is a JSDoc construct signature, then skip the first parameter in the
                 // parameter list.  The first parameter represents the return type of the construct
@@ -5252,13 +5252,11 @@ namespace ts {
                         hasLiteralTypes = true;
                     }
 
-                    const isUntypedParamInJSFile = isUntypedSignatureInJSFile && !param.type && !getJSDocParameterTags(param);
-
                     // 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) ||
-                        isUntypedParamInJSFile;
+                        isUntypedSignatureInJSFile;
                     if (!isOptionalParameter) {
                         minArgumentCount = parameters.length;
                     }
diff --git a/src/compiler/utilities.ts b/src/compiler/utilities.ts
index 01cfcb08047..9935c2fb849 100644
--- a/src/compiler/utilities.ts
+++ b/src/compiler/utilities.ts
@@ -1518,6 +1518,11 @@ namespace ts {
         return map(getJSDocs(node), doc => doc.comment);
     }
 
+    export function hasJSDocParamterTags(node: FunctionLikeDeclaration | SignatureDeclaration) {
+        const parameterTags = getJSDocTags(node, SyntaxKind.JSDocParameterTag);
+        return parameterTags && parameterTags.length > 0;
+    }
+
     function getJSDocTags(node: Node, kind: SyntaxKind): JSDocTag[] {
         const docs = getJSDocs(node);
         if (docs) {