diff --git a/utils/svg2png/svg2png.cpp b/utils/svg2png/svg2png.cpp
index 269e722ed..e2b07358d 100644
--- a/utils/svg2png/svg2png.cpp
+++ b/utils/svg2png/svg2png.cpp
@@ -24,6 +24,7 @@
 #include <sstream>
 #include <vector>
 #include <string>
+#include <cmath>
 
 #include <mapnik/version.hpp>
 #include <mapnik/debug.hpp>
@@ -78,8 +79,8 @@ struct main_marker_visitor
         double svg_width = w * scale_factor_;
         double svg_height = h * scale_factor_;
 
-        int output_width = static_cast<int>(svg_width + 0.5);
-        int output_height = static_cast<int>(svg_height + 0.5);
+        int output_width = static_cast<int>(std::round(svg_width));
+        int output_height = static_cast<int>(std::round(svg_height));
         if (verbose_)
         {
             std::clog << "Found width of '" << w << "' and height of '" << h << "'\n";