diff --git a/src/gfxinit.cpp b/src/gfxinit.cpp
--- a/src/gfxinit.cpp
+++ b/src/gfxinit.cpp
@@ -399,6 +399,9 @@ static void LoadSpriteTables()
 	assert(load_index == SPR_TRAMWAY_BASE);
 	load_index += LoadGrfFile("tramtrkw.grf", load_index, i++);
 
+	assert(load_index == SPR_ONEWAY_BASE);
+	load_index += LoadGrfFile("oneway.grf", load_index, i++);
+
 	/* Initialize the unicode to sprite mapping table */
 	InitializeUnicodeGlyphMap();