diff --git a/lib/spack/docs/packaging_guide.rst b/lib/spack/docs/packaging_guide.rst
index 5b0e556b34d..ea5cc347ced 100644
--- a/lib/spack/docs/packaging_guide.rst
+++ b/lib/spack/docs/packaging_guide.rst
@@ -3525,7 +3525,7 @@ will likely contain some overriding of default builder methods:
        def cmake_args(self):
            pass
 
-   class Autotoolsbuilder(spack.build_systems.autotools.AutotoolsBuilder):
+   class AutotoolsBuilder(spack.build_systems.autotools.AutotoolsBuilder):
        def configure_args(self):
            pass