diff --git a/modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/TypeScriptInversifyClientCodegen.java b/modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/TypeScriptInversifyClientCodegen.java
index 6de4f086413..b4b05924917 100644
--- a/modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/TypeScriptInversifyClientCodegen.java
+++ b/modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/TypeScriptInversifyClientCodegen.java
@@ -188,6 +188,9 @@ public class TypeScriptInversifyClientCodegen extends AbstractTypeScriptClientCo
     public void postProcessParameter(CodegenParameter parameter) {
         super.postProcessParameter(parameter);
         parameter.dataType = applyLocalTypeMapping(parameter.dataType);
+        if (parameter.isFormParam && parameter.isArray && "binary".equals(parameter.dataFormat)) {
+            parameter.isCollectionFormatMulti = true;
+        }
     }
 
     @Override