diff --git a/src/soplex/spxfileio.h b/src/soplex/spxfileio.h
index 035b30e0..4bff223c 100644
--- a/src/soplex/spxfileio.h
+++ b/src/soplex/spxfileio.h
@@ -41,7 +41,7 @@
  *-----------------------------------------------------------------------------
  */
 #ifdef SOPLEX_WITH_ZLIB
-#include "soplex/external/zstr/zstr.hpp"
+#include "zstr.hpp"
 #endif // WITH_GSZSTREAM
 
 namespace soplex