diff --git a/firmware/include/Makefile.am b/firmware/include/Makefile.am
index e17726c..d12fce3 100644
--- a/firmware/include/Makefile.am
+++ b/firmware/include/Makefile.am
@@ -55,7 +55,7 @@ EXTRA_DIST = 			\
 	$(CODE_GENERATOR)
 
 fpga_regs_common.v: fpga_regs_common.h generate_regs.py 
-	PYTHONPATH=$(top_srcdir)/usrp/firmware/include $(PYTHON) $(srcdir)/generate_regs.py $(srcdir)/fpga_regs_common.h $@
+	PYTHONPATH=$(top_srcdir)/usrp/firmware/include $(srcdir)/generate_regs.py $(srcdir)/fpga_regs_common.h $@
 
 fpga_regs_standard.v: fpga_regs_standard.h generate_regs.py
-	PYTHONPATH=$(top_srcdir)/usrp/firmware/include $(PYTHON) $(srcdir)/generate_regs.py $(srcdir)/fpga_regs_standard.h $@
+	PYTHONPATH=$(top_srcdir)/usrp/firmware/include $(srcdir)/generate_regs.py $(srcdir)/fpga_regs_standard.h $@
diff --git a/firmware/include/generate_regs.py b/firmware/include/generate_regs.py
index 656cd5e..f11baad 100755
--- a/firmware/include/generate_regs.py
+++ b/firmware/include/generate_regs.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python2
 
 import os, os.path
 import re