diff --git a/src/main.c b/src/main.c
index 4ae28cde..629a152e 100644
--- a/src/main.c
+++ b/src/main.c
@@ -1409,6 +1409,9 @@ int main(int argc,char * argv[])
     return 0;
   }
 
+#ifdef _MSC_VER
+  GFX2_Log(GFX2_DEBUG, "built with _MSC_VER=%d\n", _MSC_VER);
+#endif
   Main_handler();
 
   Program_shutdown();
diff --git a/src/oldies.c b/src/oldies.c
index d02ac652..8997f639 100644
--- a/src/oldies.c
+++ b/src/oldies.c
@@ -38,6 +38,13 @@
 #include "windows.h"
 #include "layers.h"
 
+// I don't have round() in MSVC++ 2010 (_MSC_VER=1600)
+#if defined(_MSC_VER)
+#if _MSC_VER < 1900
+#define round(x) floor(x+0.5)
+#endif
+#endif
+
 static void Set_Pixel_in_layer(word x,word y, byte layer, byte color)
 {
   *((y)*Main.image_width+(x)+Main.backups->Pages->Image[layer].Pixels)=color;