diff --git a/layout/svg/base/src/nsSVGPatternFrame.cpp b/layout/svg/base/src/nsSVGPatternFrame.cpp
index 7e1be50a7611..1eb4d0c846ef 100644
--- a/layout/svg/base/src/nsSVGPatternFrame.cpp
+++ b/layout/svg/base/src/nsSVGPatternFrame.cpp
@@ -580,14 +580,10 @@ nsSVGPatternFrame::ConstructCTM(const gfxRect &callerBBox,
     tCTM.Scale(scale, scale);
   }
 
-  const nsSVGViewBox& viewBox = GetViewBox();
-  if (!viewBox.IsValid()) {
-    return tCTM;
-  }
-  const nsSVGViewBoxRect viewBoxRect = GetViewBox().GetAnimValue();
+  const nsSVGViewBoxRect viewBox = GetViewBox().GetAnimValue();
 
-  if (viewBoxRect.height <= 0.0f || viewBoxRect.width <= 0.0f) {
-    return gfxMatrix(0.0, 0.0, 0.0, 0.0, 0.0, 0.0); // singular
+  if (viewBox.height <= 0.0f || viewBox.width <= 0.0f) {
+    return tCTM;
   }
 
   float viewportWidth, viewportHeight;
@@ -606,16 +602,11 @@ nsSVGPatternFrame::ConstructCTM(const gfxRect &callerBBox,
     viewportHeight =
       GetLengthValue(nsSVGPatternElement::HEIGHT)->GetAnimValue(aTarget);
   }
-
-  if (viewportWidth <= 0.0f || viewportHeight <= 0.0f) {
-    return gfxMatrix(0.0, 0.0, 0.0, 0.0, 0.0, 0.0); // singular
-  }
-
   gfxMatrix tm = nsSVGUtils::GetViewBoxTransform(
     static_cast<nsSVGPatternElement*>(mContent),
     viewportWidth, viewportHeight,
-    viewBoxRect.x, viewBoxRect.y,
-    viewBoxRect.width, viewBoxRect.height,
+    viewBox.x, viewBox.y,
+    viewBox.width, viewBox.height,
     GetPreserveAspectRatio());
 
   return tm * tCTM;
diff --git a/layout/svg/crashtests/740627-1.svg b/layout/svg/crashtests/740627-1.svg
deleted file mode 100644
index b74fcd2ddd7a..000000000000
--- a/layout/svg/crashtests/740627-1.svg
+++ /dev/null
@@ -1,6 +0,0 @@
-<svg xmlns="http://www.w3.org/2000/svg">
-  <pattern id="test" viewBox="0 0 10 10" height="-65%">
-    <rect/>
-  </pattern>
-  <rect width="100" height="100" fill="url(#test)"/>
-</svg>
diff --git a/layout/svg/crashtests/740627-2.svg b/layout/svg/crashtests/740627-2.svg
deleted file mode 100644
index 6241ddaae574..000000000000
--- a/layout/svg/crashtests/740627-2.svg
+++ /dev/null
@@ -1,6 +0,0 @@
-<svg xmlns="http://www.w3.org/2000/svg">
-  <pattern id="test" viewBox="0 0 10 10" width="-65%">
-    <rect/>
-  </pattern>
-  <rect width="100" height="100" fill="url(#test)"/>
-</svg>
diff --git a/layout/svg/crashtests/crashtests.list b/layout/svg/crashtests/crashtests.list
index bbe473014cc1..467879c3006a 100644
--- a/layout/svg/crashtests/crashtests.list
+++ b/layout/svg/crashtests/crashtests.list
@@ -125,5 +125,3 @@ load 713413-1.svg
 load 722003-1.svg
 load 725918-1.svg
 load 732836-1.svg
-load 740627-1.svg
-load 740627-2.svg