diff --git a/src/base/stringUtils.cpp b/src/base/stringUtils.cpp
index ab6a9f5a5..771d1a428 100644
--- a/src/base/stringUtils.cpp
+++ b/src/base/stringUtils.cpp
@@ -68,7 +68,7 @@ std::string vec2str(const vector_fp& v, const std::string& fmt,
     std::stringstream o;
     for (size_t i = 0; i < v.size(); i++) {
         SNPRINTF(buf, 63, fmt.c_str(), v[i]);
-        o << v[i];
+        o << buf;
         if (i != v.size() - 1) {
             o << sep;
         }