diff --git a/test/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.plinear/get_param.pass.cpp b/test/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.plinear/get_param.pass.cpp
index 450166630..57a8ca558 100644
--- a/test/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.plinear/get_param.pass.cpp
+++ b/test/numerics/rand/rand.dis/rand.dist.samp/rand.dist.samp.plinear/get_param.pass.cpp
@@ -25,7 +25,7 @@ int main()
         double b[] = {10, 14, 16, 17};
         double p[] = {25, 62.5, 12.5, 10};
         const size_t Np = sizeof(p) / sizeof(p[0]);
-        P pa(b, b+Np+1, p);
+        P pa(b, b+Np, p);
         D d(pa);
         assert(d.param() == pa);
     }