diff --git a/content/svg/content/src/nsSVGFilters.cpp b/content/svg/content/src/nsSVGFilters.cpp
index e380941fc63..d10db53dc47 100644
--- a/content/svg/content/src/nsSVGFilters.cpp
+++ b/content/svg/content/src/nsSVGFilters.cpp
@@ -1499,8 +1499,8 @@ nsSVGFECompositeElement::Filter(nsSVGFilterInstance *instance,
       for (PRInt32 y = rect.y; y < rect.YMost(); y++) {
         PRUint32 targIndex = y * stride + 4 * x;
         for (PRInt32 i = 0; i < 4; i++) {
-          PRUint8 i2 = targetData[targIndex + i];
-          PRUint8 i1 = sourceData[targIndex + i];
+          PRUint8 i1 = targetData[targIndex + i];
+          PRUint8 i2 = sourceData[targIndex + i];
           float result = k1Scaled*i1*i2 + k2*i1 + k3*i2 + k4Scaled;
           targetData[targIndex + i] =
                        static_cast<PRUint8>(PR_MIN(PR_MAX(0, result), 255));
diff --git a/layout/reftests/svg/filters/feComposite-arguments-01.svg b/layout/reftests/svg/filters/feComposite-arguments-01.svg
new file mode 100644
index 00000000000..acec685ffc1
--- /dev/null
+++ b/layout/reftests/svg/filters/feComposite-arguments-01.svg
@@ -0,0 +1,12 @@
+<svg xmlns="http://www.w3.org/2000/svg">
+  <defs>
+    <filter id="filter">
+      <feFlood flood-color="lime" result="flood1"/>
+      <feFlood flood-color="red" result="flood2"/>
+      <feComposite in="flood1" in2="flood2"
+                   operator="arithmetic" k1="0" k2="1" k3="0" k4="0" />
+    </filter>
+  </defs>
+  <rect width="100%" height="100%" fill="yellow" filter="url(#filter)"/>
+</svg>
+
diff --git a/layout/reftests/svg/filters/reftest.list b/layout/reftests/svg/filters/reftest.list
index dc78a302b21..8aa6debe22b 100644
--- a/layout/reftests/svg/filters/reftest.list
+++ b/layout/reftests/svg/filters/reftest.list
@@ -67,6 +67,7 @@ fails == filter-marked-line-01.svg pass.svg # bug 477704
 == filter-patterned-rect-01.svg pass.svg
 == filter-patterned-rect-02.svg pass.svg
 
+== feComposite-arguments-01.svg pass.svg
 == feConvolveMatrix-order-01.svg feConvolveMatrix-order-01-ref.svg
 
 == feMorphology-radius-negative-01.svg pass.svg