diff --git a/rtl/axis_arb_mux.py b/rtl/axis_arb_mux.py
index 9d37839d..e0c12869 100755
--- a/rtl/axis_arb_mux.py
+++ b/rtl/axis_arb_mux.py
@@ -13,7 +13,7 @@ Usage: axis_arb_mux [OPTION]...
 import io
 import sys
 import getopt
-from math import *
+import math
 from jinja2 import Template
 
 class Usage(Exception):
@@ -66,7 +66,7 @@ def main(argv=None):
 
     print("Generating {0} port AXI Stream arbitrated mux {1}...".format(ports, name))
 
-    select_width = ceil(log2(ports))
+    select_width = int(math.ceil(math.log(ports, 2)))
 
     t = Template(u"""/*
 
diff --git a/rtl/axis_arb_mux_64.py b/rtl/axis_arb_mux_64.py
index 873c2e2a..ecbd8101 100755
--- a/rtl/axis_arb_mux_64.py
+++ b/rtl/axis_arb_mux_64.py
@@ -13,7 +13,7 @@ Usage: axis_arb_mux_64 [OPTION]...
 import io
 import sys
 import getopt
-from math import *
+import math
 from jinja2 import Template
 
 class Usage(Exception):
@@ -66,7 +66,7 @@ def main(argv=None):
 
     print("Generating {0} port AXI Stream arbitrated mux {1}...".format(ports, name))
 
-    select_width = ceil(log2(ports))
+    select_width = int(math.ceil(math.log(ports, 2)))
 
     t = Template(u"""/*
 
diff --git a/rtl/axis_crosspoint.py b/rtl/axis_crosspoint.py
index e37707bb..985aae77 100755
--- a/rtl/axis_crosspoint.py
+++ b/rtl/axis_crosspoint.py
@@ -13,7 +13,7 @@ Usage: axis_crosspoint [OPTION]...
 import io
 import sys
 import getopt
-from math import *
+import math
 from jinja2 import Template
 
 class Usage(Exception):
@@ -66,7 +66,7 @@ def main(argv=None):
 
     print("Generating {0} port AXI Stream crosspoint {1}...".format(ports, name))
 
-    select_width = ceil(log2(ports))
+    select_width = int(math.ceil(math.log(ports, 2)))
 
     t = Template(u"""/*
 
diff --git a/rtl/axis_crosspoint_64.py b/rtl/axis_crosspoint_64.py
index 12dbe8ae..158396e1 100755
--- a/rtl/axis_crosspoint_64.py
+++ b/rtl/axis_crosspoint_64.py
@@ -13,7 +13,7 @@ Usage: axis_crosspoint_64 [OPTION]...
 import io
 import sys
 import getopt
-from math import *
+import math
 from jinja2 import Template
 
 class Usage(Exception):
@@ -66,7 +66,7 @@ def main(argv=None):
 
     print("Generating {0} port AXI Stream crosspoint {1}...".format(ports, name))
 
-    select_width = ceil(log2(ports))
+    select_width = int(math.ceil(math.log(ports, 2)))
 
     t = Template(u"""/*
 
diff --git a/rtl/axis_demux.py b/rtl/axis_demux.py
index d7ce6cea..ac32eca9 100755
--- a/rtl/axis_demux.py
+++ b/rtl/axis_demux.py
@@ -13,7 +13,7 @@ Usage: axis_demux [OPTION]...
 import io
 import sys
 import getopt
-from math import *
+import math
 from jinja2 import Template
 
 class Usage(Exception):
@@ -66,7 +66,7 @@ def main(argv=None):
 
     print("Generating {0} port AXI Stream demux {1}...".format(ports, name))
 
-    select_width = ceil(log2(ports))
+    select_width = int(math.ceil(math.log(ports, 2)))
 
     t = Template(u"""/*
 
diff --git a/rtl/axis_demux_64.py b/rtl/axis_demux_64.py
index cf927c1f..807f19bf 100755
--- a/rtl/axis_demux_64.py
+++ b/rtl/axis_demux_64.py
@@ -13,7 +13,7 @@ Usage: axis_demux_64 [OPTION]...
 import io
 import sys
 import getopt
-from math import *
+import math
 from jinja2 import Template
 
 class Usage(Exception):
@@ -66,7 +66,7 @@ def main(argv=None):
 
     print("Generating {0} port AXI Stream demux {1}...".format(ports, name))
 
-    select_width = ceil(log2(ports))
+    select_width = int(math.ceil(math.log(ports, 2)))
 
     t = Template(u"""/*
 
diff --git a/rtl/axis_frame_join.py b/rtl/axis_frame_join.py
index c01ed0ff..896f50c7 100755
--- a/rtl/axis_frame_join.py
+++ b/rtl/axis_frame_join.py
@@ -13,7 +13,7 @@ Usage: axis_frame_join [OPTION]...
 import io
 import sys
 import getopt
-from math import *
+import math
 from jinja2 import Template
 
 class Usage(Exception):
@@ -66,7 +66,7 @@ def main(argv=None):
     
     print("Generating {0} port AXI Stream frame joiner {1}...".format(ports, name))
     
-    select_width = ceil(log2(ports))
+    select_width = int(math.ceil(math.log(ports, 2)))
     
     t = Template(u"""/*
 
diff --git a/rtl/axis_mux.py b/rtl/axis_mux.py
index 122c9602..8230bfd4 100755
--- a/rtl/axis_mux.py
+++ b/rtl/axis_mux.py
@@ -13,7 +13,7 @@ Usage: axis_mux [OPTION]...
 import io
 import sys
 import getopt
-from math import *
+import math
 from jinja2 import Template
 
 class Usage(Exception):
@@ -66,7 +66,7 @@ def main(argv=None):
 
     print("Generating {0} port AXI Stream mux {1}...".format(ports, name))
 
-    select_width = ceil(log2(ports))
+    select_width = int(math.ceil(math.log(ports, 2)))
 
     t = Template(u"""/*
 
diff --git a/rtl/axis_mux_64.py b/rtl/axis_mux_64.py
index 29b3f7aa..31fd2a66 100755
--- a/rtl/axis_mux_64.py
+++ b/rtl/axis_mux_64.py
@@ -13,7 +13,7 @@ Usage: axis_mux_64 [OPTION]...
 import io
 import sys
 import getopt
-from math import *
+import math
 from jinja2 import Template
 
 class Usage(Exception):
@@ -66,7 +66,7 @@ def main(argv=None):
 
     print("Generating {0} port AXI Stream mux {1}...".format(ports, name))
 
-    select_width = ceil(log2(ports))
+    select_width = int(math.ceil(math.log(ports, 2)))
 
     t = Template(u"""/*