diff --git a/src/Data/QRMatrix.php b/src/Data/QRMatrix.php
index b77cad87c..0f291b031 100755
--- a/src/Data/QRMatrix.php
+++ b/src/Data/QRMatrix.php
@@ -508,6 +508,7 @@ class QRMatrix{
 
 	/**
 	 * Clears a space of $width * $height in order to add a logo or text.
+	 * If no $height is given, the space will be assumed a square of $width.
 	 *
 	 * Additionally, the logo space can be positioned within the QR Code - respecting the main functional patterns -
 	 * using $startX and $startY. If either of these are null, the logo space will be centered in that direction.
@@ -524,13 +525,17 @@ class QRMatrix{
 	 *
 	 * @throws \chillerlan\QRCode\Data\QRCodeDataException
 	 */
-	public function setLogoSpace(int $width, int $height, int $startX = null, int $startY = null):self{
+	public function setLogoSpace(int $width, int $height = null, int $startX = null, int $startY = null):self{
 
 		// for logos we operate in ECC H (30%) only
 		if($this->eccLevel->getLevel() !== EccLevel::H){
 			throw new QRCodeDataException('ECC level "H" required to add logo space');
 		}
 
+		if($height === null){
+			$height = $width;
+		}
+
 		// if width and height happen to be negative or 0 (default value), just return - nothing to do
 		if($width <= 0 || $height <= 0){
 			return $this; // @codeCoverageIgnore
diff --git a/src/Decoder/BitMatrix.php b/src/Decoder/BitMatrix.php
index a19791191..fda1b4721 100644
--- a/src/Decoder/BitMatrix.php
+++ b/src/Decoder/BitMatrix.php
@@ -429,7 +429,7 @@ final class BitMatrix extends QRMatrix{
 	 * @codeCoverageIgnore
 	 * @throws \chillerlan\QRCode\Data\QRCodeDataException
 	 */
-	public function setLogoSpace(int $width, int $height, int $startX = null, int $startY = null):self{
+	public function setLogoSpace(int $width, int $height = null, int $startX = null, int $startY = null):self{
 		throw new QRCodeDataException('not supported');
 	}
 
diff --git a/src/QRCode.php b/src/QRCode.php
index 2fca74a12..096a36336 100755
--- a/src/QRCode.php
+++ b/src/QRCode.php
@@ -231,9 +231,18 @@ class QRCode{
 
 		// add matrix modifications after mask pattern evaluation and before handing over to output
 		if($this->options->addLogoSpace){
+			$logoSpaceWidth  = $this->options->logoSpaceWidth;
+			$logoSpaceHeight = $this->options->logoSpaceHeight;
+
+			// check whether one of the dimensions was omitted
+			if($logoSpaceWidth === null || $logoSpaceHeight === null){
+				$logoSpaceWidth  = $logoSpaceWidth ?? $logoSpaceHeight ?? 0;
+				$logoSpaceHeight = null;
+			}
+
 			$matrix->setLogoSpace(
-				$this->options->logoSpaceWidth,
-				$this->options->logoSpaceHeight,
+				$logoSpaceWidth,
+				$logoSpaceHeight,
 				$this->options->logoSpaceStartX,
 				$this->options->logoSpaceStartY
 			);
diff --git a/src/QROptionsTrait.php b/src/QROptionsTrait.php
index 39d7a9318..cf6bd6dd0 100644
--- a/src/QROptionsTrait.php
+++ b/src/QROptionsTrait.php
@@ -333,13 +333,17 @@ trait QROptionsTrait{
 
 	/**
 	 * width of the logo space
+	 *
+	 * if only either $logoSpaceWidth or $logoSpaceHeight is given, the logo space is assumed a square of that size
 	 */
-	protected int $logoSpaceWidth = 0;
+	protected ?int $logoSpaceWidth = null;
 
 	/**
 	 * height of the logo space
+	 *
+	 * if only either $logoSpaceWidth or $logoSpaceHeight is given, the logo space is assumed a square of that size
 	 */
-	protected int $logoSpaceHeight = 0;
+	protected ?int $logoSpaceHeight = null;
 
 	/**
 	 * optional horizontal start position of the logo space (top left corner)
@@ -476,21 +480,26 @@ trait QROptionsTrait{
 	/**
 	 * clamp the logo space values between 0 and maximum length (177 modules at version 40)
 	 */
-	protected function clampLogoSpaceValue(int $value):int{
+	protected function clampLogoSpaceValue(?int $value):?int{
+
+		if($value === null){
+			return null;
+		}
+
 		return (int)max(0, min(177, $value));
 	}
 
 	/**
 	 * clamp/set logo space width
 	 */
-	protected function set_logoSpaceWidth(int $value):void{
+	protected function set_logoSpaceWidth(?int $value):void{
 		$this->logoSpaceWidth = $this->clampLogoSpaceValue($value);
 	}
 
 	/**
 	 * clamp/set logo space height
 	 */
-	protected function set_logoSpaceHeight(int $value):void{
+	protected function set_logoSpaceHeight(?int $value):void{
 		$this->logoSpaceHeight = $this->clampLogoSpaceValue($value);
 	}
 
@@ -498,14 +507,14 @@ trait QROptionsTrait{
 	 * clamp/set horizontal logo space start
 	 */
 	protected function set_logoSpaceStartX(?int $value):void{
-		$this->logoSpaceStartX = $value === null ? null : $this->clampLogoSpaceValue($value);
+		$this->logoSpaceStartX = $this->clampLogoSpaceValue($value);
 	}
 
 	/**
 	 * clamp/set vertical logo space start
 	 */
 	protected function set_logoSpaceStartY(?int $value):void{
-		$this->logoSpaceStartY = $value === null ? null : $this->clampLogoSpaceValue($value);
+		$this->logoSpaceStartY = $this->clampLogoSpaceValue($value);
 	}
 
 	/**
diff --git a/tests/Data/QRMatrixTest.php b/tests/Data/QRMatrixTest.php
index 5629b2e3f..2b63bc6a6 100755
--- a/tests/Data/QRMatrixTest.php
+++ b/tests/Data/QRMatrixTest.php
@@ -352,6 +352,28 @@ final class QRMatrixTest extends TestCase{
 		$this->matrix->setQuietZone(42);
 	}
 
+	/**
+	 * Tests if the logo space is drawn square if one of the dimensions is omitted
+	 */
+	public function testSetLogoSpaceOmitHeight():void{
+		$o = new QROptions;
+		$o->version         = 2;
+		$o->eccLevel        = EccLevel::H;
+		$o->addQuietzone    = false;
+		$o->addLogoSpace    = true;
+		$o->logoSpaceHeight = 5;
+
+		$matrix = (new QRCode($o))->addByteSegment('testdata')->getMatrix();
+
+		self::debugMatrix($matrix);
+
+		$this::assertFalse($matrix->checkType(9, 9, QRMatrix::M_LOGO));
+		$this::assertTrue($matrix->checkType(10, 10, QRMatrix::M_LOGO));
+
+		$this::assertTrue($matrix->checkType(14, 14, QRMatrix::M_LOGO));
+		$this::assertFalse($matrix->checkType(15, 15, QRMatrix::M_LOGO));
+	}
+
 	/**
 	 * Tests the auto orientation of the logo space
 	 */