diff --git a/scripts/plot.py b/scripts/plot.py
index 079f04b1..b2d1e31a 100755
--- a/scripts/plot.py
+++ b/scripts/plot.py
@@ -101,7 +101,7 @@ def si(x, w=4):
     #
     # note we adjust this so that 100K = .1M, which has more info
     # per character
-    p = 3*int(mt.log(abs(x)*10, 10**3))
+    p = 3*mt.floor(mt.log(abs(x)*10, 10**3))
     p = min(18, max(-18, p))
     # format with enough digits
     s = '%.*f' % (w, abs(x) / (10.0**p))
@@ -120,7 +120,7 @@ def si2(x, w=5):
     #
     # note we adjust this so that 128Ki = .1Mi, which has more info
     # per character
-    p = 10*int(mt.log(abs(x)*10, 2**10))
+    p = 10*mt.floor(mt.log(abs(x)*10, 2**10))
     p = min(30, max(-30, p))
     # format with enough digits
     s = '%.*f' % (w, abs(x) / (2.0**p))
diff --git a/scripts/plotmpl.py b/scripts/plotmpl.py
index 0ac77394..34bb1f54 100755
--- a/scripts/plotmpl.py
+++ b/scripts/plotmpl.py
@@ -105,7 +105,7 @@ def si(x):
     if x == 0:
         return '0'
     # figure out prefix and scale
-    p = 3*int(mt.log(abs(x), 10**3))
+    p = 3*mt.floor(mt.log(abs(x), 10**3))
     p = min(18, max(-18, p))
     # format with 3 digits of precision
     s = '%.3f' % (abs(x) / (10.0**p))
@@ -121,7 +121,7 @@ def si2(x):
     if x == 0:
         return '0'
     # figure out prefix and scale
-    p = 10*int(mt.log(abs(x), 2**10))
+    p = 10*mt.floor(mt.log(abs(x), 2**10))
     p = min(30, max(-30, p))
     # format with 3 digits of precision
     s = '%.3f' % (abs(x) / (2.0**p))