diff --git a/src/spriteloader/png.cpp b/src/spriteloader/png.cpp
--- a/src/spriteloader/png.cpp
+++ b/src/spriteloader/png.cpp
@@ -43,7 +43,7 @@ static bool OpenPNGFile(const char *file
 	const char *sep = (filename[0] == PATHSEPCHAR) ? "" : PATHSEP;
 	snprintf(png_file, sizeof(png_file), "sprites%s%s" PATHSEP "%d%s.png", sep, filename, id, mask ? "m" : "");
 	if (FioCheckFileExists(png_file)) {
-		FioOpenFile(PNG_SLOT, png_file);
+		FioOpenFile(PNG_SLOT, png_file, NEWGRF_DIR);
 		return true;
 	}