diff --git a/test/hilbert.go b/test/hilbert.go
index 163313e852..9438045c86 100644
--- a/test/hilbert.go
+++ b/test/hilbert.go
@@ -74,7 +74,7 @@ func NewHilbert(n int) *Matrix {
 	a := NewMatrix(n, n);
 	for i := 0; i < n; i++ {
 		for j := 0; j < n; j++ {
-			x := Big.Rat(1, i + j + 1);
+			x := Big.Rat(1, int64(i + j + 1));
 			a.set(i, j, x);
 		}
 	}
@@ -95,7 +95,7 @@ func NewInverseHilbert(n int) *Matrix {
 			if (i+j)&1 != 0 {
 				x0 = x0.Neg();
 			}
-			x1 := Big.Rat(i + j + 1, 1);
+			x1 := Big.Rat(int64(i + j + 1), 1);
 			x2 := MakeRat(Big.Binomial(uint(n+i), uint(n-j-1)));
 			x3 := MakeRat(Big.Binomial(uint(n+j), uint(n-i-1)));
 			x4 := MakeRat(Big.Binomial(uint(i+j), uint(i)));