diff --git a/include/llmr/platform/platform.hpp b/include/llmr/platform/platform.hpp
index d280ebb3a..f46da3c19 100644
--- a/include/llmr/platform/platform.hpp
+++ b/include/llmr/platform/platform.hpp
@@ -5,11 +5,11 @@
 #include <functional>
 #include <string>
 
-#define kTileURL "http://a.gl-api-us-east-1.tilestream.net/v3/mapbox.mapbox-streets-v4/%d/%d/%d.gl.pbf"
-#define kSpriteURL "https://dl.dropboxusercontent.com/u/575564/sprite"
-
 namespace llmr {
 
+extern const char *kTileURL;
+extern const char *kSpriteURL;
+
 namespace platform {
 
 // Restarts painting. This could for example trigger the event loop of the controlling application.
diff --git a/src/platform/platform.cpp b/src/platform/platform.cpp
new file mode 100644
index 000000000..ebe65184a
--- /dev/null
+++ b/src/platform/platform.cpp
@@ -0,0 +1,4 @@
+#include <llmr/platform/platform.hpp>
+
+const char *llmr::kTileURL = "http://a.gl-api-us-east-1.tilestream.net/v3/mapbox.mapbox-streets-v4/%d/%d/%d.gl.pbf";
+const char *llmr::kSpriteURL = "https://dl.dropboxusercontent.com/u/575564/sprite";