diff --git a/CppUnitLite/SimpleString.cpp b/CppUnitLite/SimpleString.cpp
index 190010d87..3fa040f63 100644
--- a/CppUnitLite/SimpleString.cpp
+++ b/CppUnitLite/SimpleString.cpp
@@ -51,7 +51,7 @@ SimpleString SimpleString::operator+ (const SimpleString& other)
 {
 	SimpleString ret;
 	delete [] ret.buffer_;
-	ret.buffer_ = new char [size() + other.size() - 1];
+	ret.buffer_ = new char [size() + other.size() + 1];
 	strcpy(ret.buffer_, buffer_);
 	strcat(ret.buffer_, other.buffer_);
 	return ret;