diff --git a/pgtype/box.go b/pgtype/box.go
index 83df0499..4c5a4406 100644
--- a/pgtype/box.go
+++ b/pgtype/box.go
@@ -116,8 +116,12 @@ func (src *Box) EncodeText(ci *ConnInfo, buf []byte) ([]byte, error) {
 		return nil, errUndefined
 	}
 
-	buf = append(buf, fmt.Sprintf(`(%f,%f),(%f,%f)`,
-		src.P[0].X, src.P[0].Y, src.P[1].X, src.P[1].Y)...)
+	buf = append(buf, fmt.Sprintf(`(%s,%s),(%s,%s)`,
+		strconv.FormatFloat(src.P[0].X, 'f', -1, 64),
+		strconv.FormatFloat(src.P[0].Y, 'f', -1, 64),
+		strconv.FormatFloat(src.P[1].X, 'f', -1, 64),
+		strconv.FormatFloat(src.P[1].Y, 'f', -1, 64),
+	)...)
 	return buf, nil
 }
 
diff --git a/pgtype/box_test.go b/pgtype/box_test.go
index f26cda68..197401f3 100644
--- a/pgtype/box_test.go
+++ b/pgtype/box_test.go
@@ -10,7 +10,7 @@ import (
 func TestBoxTranscode(t *testing.T) {
 	testutil.TestSuccessfulTranscode(t, "box", []interface{}{
 		&pgtype.Box{
-			P:      [2]pgtype.Vec2{{7.1, 5.234}, {3.14, 1.678}},
+			P:      [2]pgtype.Vec2{{7.1, 5.2345678}, {3.14, 1.678}},
 			Status: pgtype.Present,
 		},
 		&pgtype.Box{
diff --git a/pgtype/circle.go b/pgtype/circle.go
index 97ecbf31..15ea447b 100644
--- a/pgtype/circle.go
+++ b/pgtype/circle.go
@@ -103,7 +103,12 @@ func (src *Circle) EncodeText(ci *ConnInfo, buf []byte) ([]byte, error) {
 		return nil, errUndefined
 	}
 
-	buf = append(buf, fmt.Sprintf(`<(%f,%f),%f>`, src.P.X, src.P.Y, src.R)...)
+	buf = append(buf, fmt.Sprintf(`<(%s,%s),%s>`,
+		strconv.FormatFloat(src.P.X, 'f', -1, 64),
+		strconv.FormatFloat(src.P.Y, 'f', -1, 64),
+		strconv.FormatFloat(src.R, 'f', -1, 64),
+	)...)
+
 	return buf, nil
 }
 
diff --git a/pgtype/circle_test.go b/pgtype/circle_test.go
index 2747d4f5..634c5832 100644
--- a/pgtype/circle_test.go
+++ b/pgtype/circle_test.go
@@ -9,7 +9,7 @@ import (
 
 func TestCircleTranscode(t *testing.T) {
 	testutil.TestSuccessfulTranscode(t, "circle", []interface{}{
-		&pgtype.Circle{P: pgtype.Vec2{1.234, 5.6789}, R: 3.5, Status: pgtype.Present},
+		&pgtype.Circle{P: pgtype.Vec2{1.234, 5.67890123}, R: 3.5, Status: pgtype.Present},
 		&pgtype.Circle{P: pgtype.Vec2{-1.234, -5.6789}, R: 12.9, Status: pgtype.Present},
 		&pgtype.Circle{Status: pgtype.Null},
 	})
diff --git a/pgtype/line.go b/pgtype/line.go
index f6eadf0e..5fdc5604 100644
--- a/pgtype/line.go
+++ b/pgtype/line.go
@@ -101,7 +101,13 @@ func (src *Line) EncodeText(ci *ConnInfo, buf []byte) ([]byte, error) {
 		return nil, errUndefined
 	}
 
-	return append(buf, fmt.Sprintf(`{%f,%f,%f}`, src.A, src.B, src.C)...), nil
+	buf = append(buf, fmt.Sprintf(`{%s,%s,%s}`,
+		strconv.FormatFloat(src.A, 'f', -1, 64),
+		strconv.FormatFloat(src.B, 'f', -1, 64),
+		strconv.FormatFloat(src.C, 'f', -1, 64),
+	)...)
+
+	return buf, nil
 }
 
 func (src *Line) EncodeBinary(ci *ConnInfo, buf []byte) ([]byte, error) {
diff --git a/pgtype/line_test.go b/pgtype/line_test.go
index 019cbf0c..200d1d4c 100644
--- a/pgtype/line_test.go
+++ b/pgtype/line_test.go
@@ -25,7 +25,7 @@ func TestLineTranscode(t *testing.T) {
 
 	testutil.TestSuccessfulTranscode(t, "line", []interface{}{
 		&pgtype.Line{
-			A: 1.23, B: 4.56, C: 7.89,
+			A: 1.23, B: 4.56, C: 7.89012345,
 			Status: pgtype.Present,
 		},
 		&pgtype.Line{
diff --git a/pgtype/lseg.go b/pgtype/lseg.go
index a9d740cf..4445ea51 100644
--- a/pgtype/lseg.go
+++ b/pgtype/lseg.go
@@ -116,8 +116,13 @@ func (src *Lseg) EncodeText(ci *ConnInfo, buf []byte) ([]byte, error) {
 		return nil, errUndefined
 	}
 
-	buf = append(buf, fmt.Sprintf(`(%f,%f),(%f,%f)`,
-		src.P[0].X, src.P[0].Y, src.P[1].X, src.P[1].Y)...)
+	buf = append(buf, fmt.Sprintf(`(%s,%s),(%s,%s)`,
+		strconv.FormatFloat(src.P[0].X, 'f', -1, 64),
+		strconv.FormatFloat(src.P[0].Y, 'f', -1, 64),
+		strconv.FormatFloat(src.P[1].X, 'f', -1, 64),
+		strconv.FormatFloat(src.P[1].Y, 'f', -1, 64),
+	)...)
+
 	return buf, nil
 }
 
diff --git a/pgtype/lseg_test.go b/pgtype/lseg_test.go
index bd394e3c..0a25090a 100644
--- a/pgtype/lseg_test.go
+++ b/pgtype/lseg_test.go
@@ -10,7 +10,7 @@ import (
 func TestLsegTranscode(t *testing.T) {
 	testutil.TestSuccessfulTranscode(t, "lseg", []interface{}{
 		&pgtype.Lseg{
-			P:      [2]pgtype.Vec2{{3.14, 1.678}, {7.1, 5.234}},
+			P:      [2]pgtype.Vec2{{3.14, 1.678}, {7.1, 5.2345678901}},
 			Status: pgtype.Present,
 		},
 		&pgtype.Lseg{
diff --git a/pgtype/path.go b/pgtype/path.go
index aa0cee8e..69083712 100644
--- a/pgtype/path.go
+++ b/pgtype/path.go
@@ -138,7 +138,10 @@ func (src *Path) EncodeText(ci *ConnInfo, buf []byte) ([]byte, error) {
 		if i > 0 {
 			buf = append(buf, ',')
 		}
-		buf = append(buf, fmt.Sprintf(`(%f,%f)`, p.X, p.Y)...)
+		buf = append(buf, fmt.Sprintf(`(%s,%s)`,
+			strconv.FormatFloat(p.X, 'f', -1, 64),
+			strconv.FormatFloat(p.Y, 'f', -1, 64),
+		)...)
 	}
 
 	return append(buf, endByte), nil
diff --git a/pgtype/path_test.go b/pgtype/path_test.go
index d213a1b4..bc2d7435 100644
--- a/pgtype/path_test.go
+++ b/pgtype/path_test.go
@@ -10,7 +10,7 @@ import (
 func TestPathTranscode(t *testing.T) {
 	testutil.TestSuccessfulTranscode(t, "path", []interface{}{
 		&pgtype.Path{
-			P:      []pgtype.Vec2{{3.14, 1.678}, {7.1, 5.234}},
+			P:      []pgtype.Vec2{{3.14, 1.678901234}, {7.1, 5.234}},
 			Closed: false,
 			Status: pgtype.Present,
 		},
diff --git a/pgtype/point.go b/pgtype/point.go
index 3132a939..98a32d34 100644
--- a/pgtype/point.go
+++ b/pgtype/point.go
@@ -98,7 +98,10 @@ func (src *Point) EncodeText(ci *ConnInfo, buf []byte) ([]byte, error) {
 		return nil, errUndefined
 	}
 
-	return append(buf, fmt.Sprintf(`(%f,%f)`, src.P.X, src.P.Y)...), nil
+	return append(buf, fmt.Sprintf(`(%s,%s)`,
+		strconv.FormatFloat(src.P.X, 'f', -1, 64),
+		strconv.FormatFloat(src.P.Y, 'f', -1, 64),
+	)...), nil
 }
 
 func (src *Point) EncodeBinary(ci *ConnInfo, buf []byte) ([]byte, error) {
diff --git a/pgtype/point_test.go b/pgtype/point_test.go
index f46b342d..af70b38b 100644
--- a/pgtype/point_test.go
+++ b/pgtype/point_test.go
@@ -9,7 +9,7 @@ import (
 
 func TestPointTranscode(t *testing.T) {
 	testutil.TestSuccessfulTranscode(t, "point", []interface{}{
-		&pgtype.Point{P: pgtype.Vec2{1.234, 5.6789}, Status: pgtype.Present},
+		&pgtype.Point{P: pgtype.Vec2{1.234, 5.6789012345}, Status: pgtype.Present},
 		&pgtype.Point{P: pgtype.Vec2{-1.234, -5.6789}, Status: pgtype.Present},
 		&pgtype.Point{Status: pgtype.Null},
 	})
diff --git a/pgtype/polygon.go b/pgtype/polygon.go
index 3f3d9f53..d84a0abd 100644
--- a/pgtype/polygon.go
+++ b/pgtype/polygon.go
@@ -125,7 +125,10 @@ func (src *Polygon) EncodeText(ci *ConnInfo, buf []byte) ([]byte, error) {
 		if i > 0 {
 			buf = append(buf, ',')
 		}
-		buf = append(buf, fmt.Sprintf(`(%f,%f)`, p.X, p.Y)...)
+		buf = append(buf, fmt.Sprintf(`(%s,%s)`,
+			strconv.FormatFloat(p.X, 'f', -1, 64),
+			strconv.FormatFloat(p.Y, 'f', -1, 64),
+		)...)
 	}
 
 	return append(buf, ')'), nil
diff --git a/pgtype/polygon_test.go b/pgtype/polygon_test.go
index 48481dc5..5ff3bbb3 100644
--- a/pgtype/polygon_test.go
+++ b/pgtype/polygon_test.go
@@ -10,7 +10,7 @@ import (
 func TestPolygonTranscode(t *testing.T) {
 	testutil.TestSuccessfulTranscode(t, "polygon", []interface{}{
 		&pgtype.Polygon{
-			P:      []pgtype.Vec2{{3.14, 1.678}, {7.1, 5.234}, {5.0, 3.234}},
+			P:      []pgtype.Vec2{{3.14, 1.678901234}, {7.1, 5.234}, {5.0, 3.234}},
 			Status: pgtype.Present,
 		},
 		&pgtype.Polygon{