diff --git a/rust2rpm/templates/crate.spec b/rust2rpm/templates/crate.spec
index ecb69c7..76e4c79 100644
--- a/rust2rpm/templates/crate.spec
+++ b/rust2rpm/templates/crate.spec
@@ -14,6 +14,11 @@
 %global debug_package %{nil}
 {% endif %}
 
+{% if use_vendor_tarball %}
+# prevent library files from being installed
+%global __cargo_is_lib() 0
+
+{% endif %}
 %global crate {{ crate_name }}
 {% if crate_version != rpm_version %}
 %global crate_version {{ crate_version }}
@@ -144,7 +149,7 @@ Requires:       {{ req }}
 
 {% endif -%}
 
-{% if rpm_library_package %}
+{% if rpm_library_package and not use_vendor_tarball %}
   {% for feature in crate_features %}
     {% if feature is none %}
       {% set pkg = "   devel" %}