diff --git a/firefox.spec b/firefox.spec
index 5d64fab..5742248 100644
--- a/firefox.spec
+++ b/firefox.spec
@@ -207,6 +207,7 @@ Requires:       mozilla-filesystem
 Requires:       nspr >= %{nspr_build_version}
 Requires:       nss >= %{nss_build_version}
 %endif
+BuildRequires:  python2-devel
 
 %if 0%{?fedora} > 25
 # For early testing of rhbz#1400293 mozbz#1324096 on F26 and Rawhide,