diff --git a/layout/reftests/svg/radialGradient-basic-03-ref.svg b/layout/reftests/svg/radialGradient-basic-03-ref.svg
new file mode 100644
index 000000000000..aabc31d420ce
--- /dev/null
+++ b/layout/reftests/svg/radialGradient-basic-03-ref.svg
@@ -0,0 +1,34 @@
+
+
\ No newline at end of file
diff --git a/layout/reftests/svg/radialGradient-basic-03.svg b/layout/reftests/svg/radialGradient-basic-03.svg
new file mode 100644
index 000000000000..8d2add380816
--- /dev/null
+++ b/layout/reftests/svg/radialGradient-basic-03.svg
@@ -0,0 +1,34 @@
+
+
\ No newline at end of file
diff --git a/layout/reftests/svg/reftest.list b/layout/reftests/svg/reftest.list
index b09fc4ab7d16..a2f811a4a8bd 100644
--- a/layout/reftests/svg/reftest.list
+++ b/layout/reftests/svg/reftest.list
@@ -81,6 +81,7 @@ random-if(MOZ_WIDGET_TOOLKIT=="cocoa") == opacity-and-gradient-01.svg pass.svg
== pseudo-classes-02.svg pseudo-classes-02-ref.svg
== radialGradient-basic-01.svg pass.svg
== radialGradient-basic-02.svg pass.svg
+== radialGradient-basic-03.svg radialGradient-basic-03-ref.svg
== rect-01.svg pass.svg
== rect-with-rx-and-ry-01.svg pass.svg
== rect-with-rx-or-ry-01.svg rect-with-rx-or-ry-01-ref.svg
diff --git a/layout/svg/base/src/nsSVGGradientFrame.cpp b/layout/svg/base/src/nsSVGGradientFrame.cpp
index 8803f624d0e9..6cf9c8108926 100644
--- a/layout/svg/base/src/nsSVGGradientFrame.cpp
+++ b/layout/svg/base/src/nsSVGGradientFrame.cpp
@@ -563,11 +563,14 @@ nsSVGRadialGradientFrame::CreateGradient()
// The focal point (fFx and fFy) must be clamped to be *inside* - not on -
// the circumference of the gradient or we'll get rendering anomalies. We
// calculate the distance from the focal point to the gradient center and
- // make sure it is *less* than the gradient radius. 0.999 is used as the
+ // make sure it is *less* than the gradient radius. 0.99 is used as the
// factor of the radius because it's close enough to 1 that we won't get a
// fringe at the edge of the gradient if we clamp, but not so close to 1
// that rounding error will give us the same results as using fR itself.
- double dMax = 0.999 * r;
+ // Also note that .99 < 255/256/2 which is the limit of the fractional part
+ // of cairo's 24.8 fixed point representation divided by 2 to ensure that
+ // we get different cairo fractions
+ double dMax = 0.99 * r;
float dx = fx - cx;
float dy = fy - cy;
double d = sqrt((dx * dx) + (dy * dy));