diff --git a/FindIonobase.cmake b/FindIonobase.cmake
index f70f63f..47e6125 100644
--- a/FindIonobase.cmake
+++ b/FindIonobase.cmake
@@ -13,7 +13,8 @@ if(NOT IONOBASE_IS_EXTERNAL_PROJECT)
   find_path(
     IONOBASE_INCLUDE_DIRS
     NAMES interchfor.h
-    HINTS ${_search_paths})
+    PATH_SUFFIXES ionobase
+    PATHS ${_search_paths})
 
   set(_search_paths "")
   if(IONOBASE_LIBRARY_DIR AND EXISTS ${IONOBASE_LIBRARY_DIR})