--- a/gfx/2d/FilterNodeSoftware.cpp
+++ b/gfx/2d/FilterNodeSoftware.cpp
@@ -3578,16 +3578,17 @@ DiffuseLightingSoftware::LightPixel(cons
     umin(uint32_t(diffuseNL * color.components[B8G8R8A8_COMPONENT_BYTEOFFSET_R]), 255U);
   color.components[B8G8R8A8_COMPONENT_BYTEOFFSET_A] = 255;
   return color.bgra;
 }
 
 SpecularLightingSoftware::SpecularLightingSoftware()
  : mSpecularConstant(0)
  , mSpecularExponent(0)
+ , mSpecularConstantInt(0)
 {
 }
 
 bool
 SpecularLightingSoftware::SetAttribute(uint32_t aIndex, Float aValue)
 {
   switch (aIndex) {
     case ATT_SPECULAR_LIGHTING_SPECULAR_CONSTANT: