diff --git a/documentation/conf.py b/documentation/conf.py
index c86229ffb627a2820a22515972e4f955dea3995d..961ba5b00c596625a9f9aff643acf71d78de2063 100644
--- a/documentation/conf.py
+++ b/documentation/conf.py
@@ -17,7 +17,7 @@ read_the_docs_build = os.environ.get('READTHEDOCS', None) == 'True'
 
 if read_the_docs_build:
     configureDoxyfile("Doxyfile.in", "Doxyfile", "../", "_build/workdir/doxygen")
-    s = subprocess.check_output(["git branch", "--show-current"])
+    s = subprocess.check_output(['git','branch', '--show-current'])
     print("s = " + s)
     subprocess.call('mkdir -p _build/workdir/doxygen; doxygen Doxyfile', shell=True)
     html_extra_path = ['_build/workdir/']