diff --git a/docs/_plugins/copy_api_dirs.rb b/docs/_plugins/copy_api_dirs.rb
index f2f3e2e65314912395c3efbfb11b65ffa18c0686..174c202e379183e4fc88cf4463698dd22bb62e41 100644
--- a/docs/_plugins/copy_api_dirs.rb
+++ b/docs/_plugins/copy_api_dirs.rb
@@ -117,7 +117,7 @@ if not (ENV['SKIP_API'] == '1')
 
   puts "Moving to python/docs directory and building sphinx."
   cd("../python/docs")
-  system(make html) || raise("Python doc generation failed")
+  system("make html") || raise("Python doc generation failed")
 
   puts "Moving back into home dir."
   cd("../../")