diff --git a/OTRExporter/OTRExporter/Makefile b/OTRExporter/OTRExporter/Makefile
index 954b183a3..1c6d230c3 100644
--- a/OTRExporter/OTRExporter/Makefile
+++ b/OTRExporter/OTRExporter/Makefile
@@ -46,6 +46,7 @@ INC_DIRS := $(addprefix -I, \
 	../../libultraship/libultraship \
 	../../libultraship/libultraship/Lib/spdlog/include \
 	../../libultraship/libultraship/Lib/Fast3D/U64 \
+	../../StormLib/src \
 )
 
 # create build directories