diff --git a/include/xlnt/drawing/spreadsheet_drawing.hpp b/include/xlnt/drawing/spreadsheet_drawing.hpp
index bd77ccf63..9b4f1bf92 100644
--- a/include/xlnt/drawing/spreadsheet_drawing.hpp
+++ b/include/xlnt/drawing/spreadsheet_drawing.hpp
@@ -45,6 +45,7 @@ namespace drawing {
 class XLNT_API spreadsheet_drawing
 {
 public:
+    spreadsheet_drawing();
     spreadsheet_drawing(xml::parser &parser);
     void serialize(xml::serializer &serializer);
 
diff --git a/include/xlnt/styles/format.hpp b/include/xlnt/styles/format.hpp
index 71dd5c8d7..5533d7610 100644
--- a/include/xlnt/styles/format.hpp
+++ b/include/xlnt/styles/format.hpp
@@ -57,6 +57,14 @@ class xlsx_consumer;
 class XLNT_API format
 {
 public:
+    /// <summary>
+    /// Default contructor.
+    /// </summary>
+    format()
+	    : d_(nullptr)
+    {		
+    };
+    
     /// <summary>
     /// Returns the alignment of this format.
     /// </summary>
diff --git a/source/drawing/spreadsheet_drawing.cpp b/source/drawing/spreadsheet_drawing.cpp
index c7f2f5894..ccbc2bebd 100644
--- a/source/drawing/spreadsheet_drawing.cpp
+++ b/source/drawing/spreadsheet_drawing.cpp
@@ -91,6 +91,12 @@ std::vector<std::string> copy_and_extract(xml::parser &p, xml::serializer &s)
 namespace xlnt {
 namespace drawing {
 
+spreadsheet_drawing::spreadsheet_drawing()
+{
+    embed_ids_ = std::vector<std::string>();
+    serialized_value_ = std::string();
+}
+    
 spreadsheet_drawing::spreadsheet_drawing(xml::parser &parser)
 {
     std::ostringstream serialization_stream;