diff --git a/srcs/StaticJsonBuffer.h b/srcs/StaticJsonBuffer.h
index 9103dcf6..91a58cbb 100644
--- a/srcs/StaticJsonBuffer.h
+++ b/srcs/StaticJsonBuffer.h
@@ -6,6 +6,12 @@ template<int CAPACITY>
 class StaticJsonBuffer //: public JsonBuffer
 {
 public:
+    
+    explicit StaticJsonBuffer()
+        : _size(0)
+    {
+    }
+
     virtual ~StaticJsonBuffer() {}
 
     int capacity()
diff --git a/tests/StaticJsonBufferTests.cpp b/tests/StaticJsonBufferTests.cpp
index a2e62c4b..a5cba9c4 100644
--- a/tests/StaticJsonBufferTests.cpp
+++ b/tests/StaticJsonBufferTests.cpp
@@ -1,8 +1,14 @@
 #include <gtest/gtest.h>
 #include <StaticJsonBuffer.h>
 
-TEST(StaticJsonBufferTests, CapacityMatchTemplateParameter)
+TEST(StaticJsonBuffer, CapacityMatchTemplateParameter)
 {
     StaticJsonBuffer<42> json;   
     EXPECT_EQ(42, json.capacity());
+}
+
+TEST(StaticJsonBuffer, InitialSizeIsZero)
+{
+    StaticJsonBuffer<42> json;
+    EXPECT_EQ(0, json.size());
 }
\ No newline at end of file