diff --git a/src/math/big/floatconv.go b/src/math/big/floatconv.go
index 4a070ca64d..0e8b7b649e 100644
--- a/src/math/big/floatconv.go
+++ b/src/math/big/floatconv.go
@@ -125,9 +125,9 @@ func (z *Float) scan(r io.ByteScanner, base int) (f *Float, b int, err error) {
 	// apply 10**exp10
 	p := new(Float).SetPrec(z.Prec() + 64) // use more bits for p -- TODO(gri) what is the right number?
 	if exp10 < 0 {
-		z.uquo(z, p.pow10(-exp10))
+		z.Quo(z, p.pow10(-exp10))
 	} else {
-		z.umul(z, p.pow10(exp10))
+		z.Mul(z, p.pow10(exp10))
 	}
 
 	return
diff --git a/src/math/big/floatconv_test.go b/src/math/big/floatconv_test.go
index 4f239534a1..156e1af300 100644
--- a/src/math/big/floatconv_test.go
+++ b/src/math/big/floatconv_test.go
@@ -367,9 +367,9 @@ func TestFloatText(t *testing.T) {
 
 		// make sure "stupid" exponents don't stall the machine
 		{"1e1000000", 64, 'p', 0, "0x.88b3a28a05eade3ap+3321929"},
-		{"1e1000000000", 64, 'p', 0, "0x.ecc5f45aa573d3p+1538481529"},
+		{"1e1000000000", 64, 'p', 0, "+Inf"},
 		{"1e-1000000", 64, 'p', 0, "0x.efb4542cc8ca418ap-3321928"},
-		{"1e-1000000000", 64, 'p', 0, "0x.8a64dd983a4c7dabp-1538481528"},
+		{"1e-1000000000", 64, 'p', 0, "0"},
 
 		// TODO(gri) need tests for actual large Floats