diff --git a/ImagickKernel.stub.php b/ImagickKernel.stub.php
index 043cd13b..3a5f7ed8 100644
--- a/ImagickKernel.stub.php
+++ b/ImagickKernel.stub.php
@@ -15,7 +15,7 @@ public function addUnityKernel(float $scale): void {}
     // KERNEL_*
     public static function fromBuiltin(int $kernel, string $shape): ImagickKernel {}
 
-    public static function fromMatrix(array $matrix, array $origin = null): ImagickKernel {}
+    public static function fromMatrix(array $matrix, ?array $origin = null): ImagickKernel {}
 
     public function getMatrix(): array {}
 
diff --git a/ImagickKernel_arginfo.h b/ImagickKernel_arginfo.h
index f74a1f19..57129332 100644
--- a/ImagickKernel_arginfo.h
+++ b/ImagickKernel_arginfo.h
@@ -70,7 +70,7 @@ ZEND_BEGIN_ARG_INFO_EX(arginfo_class_ImagickKernel_fromMatrix, 0, 0, 1)
 #endif
 
 #if PHP_VERSION_ID >= 80000
-    ZEND_ARG_TYPE_INFO_WITH_DEFAULT_VALUE(0, origin, IS_ARRAY, 0, "null")
+    ZEND_ARG_TYPE_INFO_WITH_DEFAULT_VALUE(0, origin, IS_ARRAY, 1, "null")
 #else
     ZEND_ARG_INFO(0, origin)
 #endif
diff --git a/imagickkernel_class.c b/imagickkernel_class.c
index eee111ac..4d8b7cb0 100644
--- a/imagickkernel_class.c
+++ b/imagickkernel_class.c
@@ -233,7 +233,6 @@ PHP_METHOD(ImagickKernel, __construct)
 */
 #if PHP_VERSION_ID >= 70000
 PHP_METHOD(ImagickKernel, fromMatrix)
-
 {
 	zval *kernel_array;
 	zval *origin_array;
@@ -257,7 +256,7 @@ PHP_METHOD(ImagickKernel, fromMatrix)
 	row = 0;
 	origin_array = NULL;
 
-	if (zend_parse_parameters(ZEND_NUM_ARGS() TSRMLS_CC, "a|a", &kernel_array, &origin_array) == FAILURE) {
+	if (zend_parse_parameters(ZEND_NUM_ARGS() TSRMLS_CC, "a|a!", &kernel_array, &origin_array) == FAILURE) {
 		RETURN_THROWS();
 	}
 
diff --git a/tests/145_imagickkernel_coverage.phpt b/tests/145_imagickkernel_coverage.phpt
index 37de74b2..a511c41e 100644
--- a/tests/145_imagickkernel_coverage.phpt
+++ b/tests/145_imagickkernel_coverage.phpt
@@ -204,6 +204,25 @@ if ($kernelMatrix !== $matrix) {
 	var_dump($kernelMatrix);
 }
 
+
+
+
+//Test Scaling, and with null origin
+$matrixIn = array(
+	array(-1, 0, -1),
+	array( 0, 8,  0),
+	array(-1, 0, -1),
+);
+$kernel = ImagickKernel::fromMatrix($matrixIn, null); // <-- line under test
+$kernel->scale(1, \Imagick::NORMALIZE_KERNEL_VALUE);
+$matrixOut = $kernel->getMatrix();
+
+if ($matrixOut[1][1] != 2) {
+	echo "Matrix was not normalised correctly.";
+	var_dump($matrixOut);
+}
+
+
 echo "Complete".PHP_EOL;
 ?>
 --EXPECTF--