diff --git a/pysynphot/obsbandpass.py b/pysynphot/obsbandpass.py
index 55ed199f..4fa870de 100644
--- a/pysynphot/obsbandpass.py
+++ b/pysynphot/obsbandpass.py
@@ -505,11 +505,11 @@ def wave_range(bins, cenwave, npix, round='round'):
     # translate ends to wavelength
     if round is None:
         # translate ends directly to wavelength without regard to bin edges
-        f, i = frac1, int1
+        f, i = frac1, int(int1)
 
         wave1 = bins[i] + frac1 * (bins[i+1] - bins[i])
 
-        f, i = frac2, int2
+        f, i = frac2, int(int2)
 
         wave2 = bins[i] + frac2 * (bins[i+1] - bins[i])
 
diff --git a/pysynphot/refs.py b/pysynphot/refs.py
index 82dab444..2fc82aff 100644
--- a/pysynphot/refs.py
+++ b/pysynphot/refs.py
@@ -43,7 +43,7 @@
 PRIMARY_AREA = 45238.93416  # cm^2 - default to HST mirror
 
 
-def set_default_waveset(minwave=500, maxwave=26000, num=10000.,
+def set_default_waveset(minwave=500, maxwave=26000, num=10000,
                         delta=None, log=True):
     """Set the default wavelength set, ``pysynphot.refs._default_waveset``.
 
@@ -69,6 +69,9 @@ def set_default_waveset(minwave=500, maxwave=26000, num=10000.,
     global _default_waveset
     global _default_waveset_str
 
+    # Must be int for numpy>=1.12
+    num = int(num)
+
     s = 'Min: %s, Max: %s, Num: %s, Delta: %s, Log: %s'
 
     if log and not delta:
diff --git a/pysynphot/test/test_ticket150.py b/pysynphot/test/test_ticket150.py
index 8316fa47..2f5fd473 100644
--- a/pysynphot/test/test_ticket150.py
+++ b/pysynphot/test/test_ticket150.py
@@ -110,7 +110,7 @@ def test_integrate(self):
 
     def test_subint(self):
         w = self.bp.wave
-        tst = self.bp.integrate(w[0:len(w)/2])
+        tst = self.bp.integrate(w[0:int(len(w)/2)])
 
         # epsilon due to the nature of trapezoid integration
         assert abs(self.ref / 2.0 - tst) <= 0.025