diff --git a/ReactCommon/yoga/yoga/YGFloatOptional.cpp b/ReactCommon/yoga/yoga/YGFloatOptional.cpp
index d023dccb6..da7b8ce83 100644
--- a/ReactCommon/yoga/yoga/YGFloatOptional.cpp
+++ b/ReactCommon/yoga/yoga/YGFloatOptional.cpp
@@ -53,7 +53,7 @@ bool YGFloatOptional::operator!=(float val) const {
   return !(*this == val);
 }
 
-YGFloatOptional YGFloatOptional::operator+(const YGFloatOptional& op) {
+YGFloatOptional YGFloatOptional::operator+(const YGFloatOptional& op) const {
   if (!isUndefined_ && !op.isUndefined_) {
     return YGFloatOptional(value_ + op.value_);
   }
diff --git a/ReactCommon/yoga/yoga/YGFloatOptional.h b/ReactCommon/yoga/yoga/YGFloatOptional.h
index 07fbb64b3..6f4af241f 100644
--- a/ReactCommon/yoga/yoga/YGFloatOptional.h
+++ b/ReactCommon/yoga/yoga/YGFloatOptional.h
@@ -30,7 +30,7 @@ struct YGFloatOptional {
     return isUndefined_;
   }
 
-  YGFloatOptional operator+(const YGFloatOptional& op);
+  YGFloatOptional operator+(const YGFloatOptional& op) const;
   bool operator>(const YGFloatOptional& op) const;
   bool operator<(const YGFloatOptional& op) const;
   bool operator>=(const YGFloatOptional& op) const;