diff --git a/gfx/src/FilterSupport.cpp b/gfx/src/FilterSupport.cpp
index 5b489e8f4ad..ef786c78d7c 100644
--- a/gfx/src/FilterSupport.cpp
+++ b/gfx/src/FilterSupport.cpp
@@ -1536,6 +1536,7 @@ FilterSupport::ComputeSourceNeededRegions(const FilterDescription& aFilter,
 
 FilterPrimitiveDescription::FilterPrimitiveDescription(PrimitiveType aType)
  : mType(aType)
+ , mOutputColorSpace(SRGB)
  , mIsTainted(false)
 {
 }