diff --git a/Makefile.in b/Makefile.in
index a5d6d1219..0d63a6f12 100755
--- a/Makefile.in
+++ b/Makefile.in
@@ -204,8 +204,10 @@ ifneq ($(build_python),0)
 	cp -f "@homedir@/setup_cantera" "@ct_bindir@"
 	chmod +x @ct_bindir@/setup_cantera
 	chmod +x @ct_bindir@/ctnew
+ifeq ($(build_python),2)
 	chmod +x @ct_bindir@/mixmaster
 endif
+endif
 else
 #          Commands to be executed for win systems
 	cd Cantera/fortran/f77demos; sed s'/isentropic/ctlib/g' isentropic.dsp > ctlib.dsp