diff --git a/libisofs/filters/zisofs.c b/libisofs/filters/zisofs.c
index e34092d..ee5d6a7 100644
--- a/libisofs/filters/zisofs.c
+++ b/libisofs/filters/zisofs.c
@@ -830,6 +830,9 @@ int ziso_cmp_ino(IsoStream *s1, IsoStream *s2)
 /* ------------------------------------------------------------------------- */
 
 
+
+#ifdef Libisofs_with_zliB
+
 static
 void ziso_filter_free(FilterContext *filter)
 {
@@ -917,8 +920,6 @@ int ziso_filter_get_uncompressor(FilterContext *filter, IsoStream *original,
 }
 
 
-#ifdef Libisofs_with_zliB
-
 /* Produce a parameter object suitable for iso_file_add_filter().
  * It may be disposed by free() after all those calls are made.
  *