diff --git a/src/compiler/checker.ts b/src/compiler/checker.ts
index abcfb35ff88..12f85eb18b6 100644
--- a/src/compiler/checker.ts
+++ b/src/compiler/checker.ts
@@ -24294,7 +24294,6 @@ namespace ts {
                 }
             }
             checkTypeParameters(getEffectiveTypeParameterDeclarations(node));
-            checkTypeParameters(node.typeParameters);
             checkExportsOnMergedDeclarations(node);
             const symbol = getSymbolOfNode(node);
             const type = <InterfaceType>getDeclaredTypeOfSymbol(symbol);