diff --git a/installer/installation.c b/installer/installation.c
index b0644a4..e31124b 100644
--- a/installer/installation.c
+++ b/installer/installation.c
@@ -432,7 +432,10 @@ ForceCloseWintunAdapterHandle(_In_ HDEVINFO DeviceInfoSet, _In_ SP_DEVINFO_DATA
         if (Ret == CR_SUCCESS)
             break;
         if (Ret != CR_BUFFER_SMALL)
+        {
+            free(InterfaceList);
             return FALSE;
+        }
     }
 
     HANDLE NdisHandle = CreateFile(
@@ -651,4 +654,4 @@ DllMain(_In_ HINSTANCE hinstDLL, _In_ DWORD fdwReason, _In_ LPVOID lpvReserved)
         break;
     }
     return TRUE;
-}
\ No newline at end of file
+}