diff --git a/libs/utils/src/CString.cpp b/libs/utils/src/CString.cpp
index 5955568587..e108545e31 100644
--- a/libs/utils/src/CString.cpp
+++ b/libs/utils/src/CString.cpp
@@ -40,7 +40,8 @@ CString::CString(const char* cstr, size_t length) {
         p->length = (size_type)length;
         mCStr = (value_type*)(p + 1);
         // we don't use memcpy here to avoid a call to libc, the generated code is pretty good.
-        std::uninitialized_copy_n(cstr, length + 1, mCStr);
+        std::uninitialized_copy_n(cstr, length, mCStr);
+        mCStr[length] = '\0';
     }
 }