diff --git a/tools/platforms/HTML5Platform.hx b/tools/platforms/HTML5Platform.hx
index a4e56924d..6d619806f 100644
--- a/tools/platforms/HTML5Platform.hx
+++ b/tools/platforms/HTML5Platform.hx
@@ -361,6 +361,9 @@ class HTML5Platform extends PlatformTarget
 			}
 		}
 
+		var createdDirectories = new Map<String, Bool>();
+		var dir = null;
+
 		for (asset in project.assets)
 		{
 			var path = Path.combine(destination, asset.targetPath);
@@ -369,7 +372,12 @@ class HTML5Platform extends PlatformTarget
 			{
 				if ( /*asset.embed != true &&*/ asset.type != AssetType.FONT)
 				{
-					System.mkdir(Path.directory(path));
+					dir = Path.directory(path);
+					if (!createdDirectories.exists(dir))
+					{
+						System.mkdir(dir);
+						createdDirectories.set(dir, true);
+					}
 					AssetHelper.copyAssetIfNewer(asset, path);
 				}
 				else if (asset.type == AssetType.FONT && useWebfonts)