diff --git a/libisofs/hfsplus_case.c b/libisofs/hfsplus_case.c
index 0a07612..b09c76e 100644
--- a/libisofs/hfsplus_case.c
+++ b/libisofs/hfsplus_case.c
@@ -12,6 +12,10 @@
  * equivalence class under the relation of HFS+ case-insensitivity.
  */
 
+#ifdef HAVE_CONFIG_H
+#include "../config.h"
+#endif
+
 #include "libisofs.h"