diff --git a/yg/tile_cache.cpp b/yg/tile_cache.cpp
index 646b547bd3..51040cc82f 100644
--- a/yg/tile_cache.cpp
+++ b/yg/tile_cache.cpp
@@ -1,9 +1,12 @@
 #include "tile_cache.hpp"
 
+#include "../std/cmath.hpp"
+
+
 namespace yg
 {
   TileCache::TileCache(size_t tileMemSize, size_t memSize)
-    : m_cache(log(memSize / tileMemSize) / log(2))
+    : m_cache(log(memSize / static_cast<double>(tileMemSize)) / log(2.0))
   {
   }