diff --git a/build_frontmatter.py b/build_frontmatter.py
index e723ce4..b849fd2 100644
--- a/build_frontmatter.py
+++ b/build_frontmatter.py
@@ -491,7 +491,7 @@ def main(eoa_publication):
         add_pdf_info(pdffilename_front, authors_line, unformatted_chapter_title, subject_string)
 
         command_file.write("cp %s%s %s%s.bak\n" % (MEDIA_DIR, chapter[7], MEDIA_DIR, chapter[7]))
-        command_file.write("cp %s %s%s\n" % (pdf_filename, MEDIA_DIR, chapter[7]))
+        command_file.write("cp '%s' %s%s\n" % (pdf_filename, MEDIA_DIR, chapter[7]))
 
     # back to normal
     command_file.close()