diff --git a/src/distributions/mod.rs b/src/distributions/mod.rs
index f637dd01d2a..e33062385b2 100644
--- a/src/distributions/mod.rs
+++ b/src/distributions/mod.rs
@@ -259,7 +259,7 @@ fn ziggurat<R: Rng, P, Z>(
             return zero_case(rng, u);
         }
         // algebraically equivalent to f1 + DRanU()*(f0 - f1) < 1
-        if f_tab[i + 1] + (f_tab[i] - f_tab[i + 1]) * rng.gen() < pdf(x) {
+        if f_tab[i + 1] + (f_tab[i] - f_tab[i + 1]) * rng.gen::<f64>() < pdf(x) {
             return x;
         }
     }
diff --git a/src/distributions/range.rs b/src/distributions/range.rs
index 932bfae4941..3244d11bcc6 100644
--- a/src/distributions/range.rs
+++ b/src/distributions/range.rs
@@ -153,7 +153,7 @@ macro_rules! float_impl {
                 }
             }
             fn sample_range<R: Rng>(r: &Range<$ty>, rng: &mut R) -> $ty {
-                r.low + r.range * rng.gen()
+                r.low + r.range * rng.gen::<$ty>()
             }
         }
     }