diff --git a/mozilla/layout/svg/base/src/nsSVGPathGeometryFrame.cpp b/mozilla/layout/svg/base/src/nsSVGPathGeometryFrame.cpp
index c131d0db61a..3dea77b3909 100644
--- a/mozilla/layout/svg/base/src/nsSVGPathGeometryFrame.cpp
+++ b/mozilla/layout/svg/base/src/nsSVGPathGeometryFrame.cpp
@@ -411,13 +411,16 @@ nsSVGPathGeometryFrame::UpdateCoveredRegion()
   if (HasStroke()) {
     SetupCairoStrokeGeometry(&context);
     cairo_stroke_extents(ctx, &xmin, &ymin, &xmax, &ymax);
-    nsSVGUtils::UserToDeviceBBox(ctx, &xmin, &ymin, &xmax, &ymax);
+    if (!IsDegeneratePath(xmin, ymin, xmax, ymax)) {
+      nsSVGUtils::UserToDeviceBBox(ctx, &xmin, &ymin, &xmax, &ymax);
+      mRect = nsSVGUtils::ToBoundingPixelRect(xmin, ymin, xmax, ymax);
+    }
   } else {
     cairo_identity_matrix(ctx);
     cairo_fill_extents(ctx, &xmin, &ymin, &xmax, &ymax);
+    if (!IsDegeneratePath(xmin, ymin, xmax, ymax))
+      mRect = nsSVGUtils::ToBoundingPixelRect(xmin, ymin, xmax, ymax);
   }
-  if (!IsDegeneratePath(xmin, ymin, xmax, ymax))
-    mRect = nsSVGUtils::ToBoundingPixelRect(xmin, ymin, xmax, ymax);
 
   // Add in markers
   mRect = GetCoveredRegion();
diff --git a/mozilla/layout/svg/base/src/nsSVGPathGeometryFrame.h b/mozilla/layout/svg/base/src/nsSVGPathGeometryFrame.h
index 3c5f1a50581..ed009d8f831 100644
--- a/mozilla/layout/svg/base/src/nsSVGPathGeometryFrame.h
+++ b/mozilla/layout/svg/base/src/nsSVGPathGeometryFrame.h
@@ -130,18 +130,17 @@ private:
   /*
    * Check for what cairo returns for the fill extents of a degenerate path
    *
-   * @param xmin the minimum x value in device units
-   * @param ymin the minimum y value in device units
-   * @param xmax the maximum x value in device units
-   * @param ymax the maximum y value in device units
+   * @param xmin the minimum x value in user units
+   * @param ymin the minimum y value in user units
+   * @param xmax the maximum x value in user units
+   * @param ymax the maximum y value in user units
    *
    * @return PR_TRUE if the path is degenerate
    */
   static PRBool
   IsDegeneratePath(double xmin, double ymin, double xmax, double ymax)
   {
-    return (fabs(xmin - 32767) < 1 && fabs(ymin - 32767) < 1 &&
-            fabs(xmax + 32768) < 1 && fabs(ymax + 32768) < 1);
+    return (xmin == 0 && ymin == 0 && xmax == 0 && ymax == 0);
   }
 
   nsSVGMarkerProperty *GetMarkerProperty();