diff --git a/layout/svg/base/src/nsSVGTextFrame.cpp b/layout/svg/base/src/nsSVGTextFrame.cpp
index fc7aa40bca6..3689b29c16c 100644
--- a/layout/svg/base/src/nsSVGTextFrame.cpp
+++ b/layout/svg/base/src/nsSVGTextFrame.cpp
@@ -1194,7 +1194,7 @@ nsSVGTextFrame::UpdateGlyphPositioning()
 
   firstFragment = node->GetFirstGlyphFragment();
 
-  float x, y;
+  float x = 0, y = 0;
 
   {
     nsCOMPtr<nsIDOMSVGLengthList> list = GetX();