diff --git a/ssd1331/ssd1331.go b/ssd1331/ssd1331.go
index 1534418..32a11c0 100644
--- a/ssd1331/ssd1331.go
+++ b/ssd1331/ssd1331.go
@@ -220,7 +220,7 @@ func (d *Device) DrawFastHLine(x0, x1, y int16, c color.RGBA) {
 	if x0 > x1 {
 		x0, x1 = x1, x0
 	}
-	d.FillRectangle(x0, y, x1-x0+1, y, c)
+	d.FillRectangle(x0, y, x1-x0+1, 1, c)
 }
 
 // FillScreen fills the screen with a given color
diff --git a/ssd1351/ssd1351.go b/ssd1351/ssd1351.go
index 2349613..89eaac9 100644
--- a/ssd1351/ssd1351.go
+++ b/ssd1351/ssd1351.go
@@ -251,7 +251,7 @@ func (d *Device) DrawFastHLine(x0, x1, y int16, c color.RGBA) {
 	if x0 > x1 {
 		x0, x1 = x1, x0
 	}
-	d.FillRectangle(x0, y, x1-x0+1, y, c)
+	d.FillRectangle(x0, y, x1-x0+1, 1, c)
 }
 
 // FillScreen fills the screen with a given color
diff --git a/st7735/st7735.go b/st7735/st7735.go
index 5909d20..d6bd463 100644
--- a/st7735/st7735.go
+++ b/st7735/st7735.go
@@ -323,7 +323,7 @@ func (d *Device) DrawFastHLine(x0, x1, y int16, c color.RGBA) {
 	if x0 > x1 {
 		x0, x1 = x1, x0
 	}
-	d.FillRectangle(x0, y, x1-x0+1, y, c)
+	d.FillRectangle(x0, y, x1-x0+1, 1, c)
 }
 
 // FillScreen fills the screen with a given color
diff --git a/st7789/st7789.go b/st7789/st7789.go
index ab45336..9aa6426 100644
--- a/st7789/st7789.go
+++ b/st7789/st7789.go
@@ -207,7 +207,7 @@ func (d *Device) DrawFastHLine(x0, x1, y int16, c color.RGBA) {
 	if x0 > x1 {
 		x0, x1 = x1, x0
 	}
-	d.FillRectangle(x0, y, x1-x0+1, y, c)
+	d.FillRectangle(x0, y, x1-x0+1, 1, c)
 }
 
 // FillScreen fills the screen with a given color