diff --git a/zconf.h b/zconf.h
index 26e7a04..97b3a70 100644
--- a/zconf.h
+++ b/zconf.h
@@ -21,6 +21,7 @@
 #  define _dist_code            z__dist_code
 #  define _length_code          z__length_code
 #  define _tr_align             z__tr_align
+#  define _tr_flush_bits        z__tr_flush_bits
 #  define _tr_flush_block       z__tr_flush_block
 #  define _tr_init              z__tr_init
 #  define _tr_stored_block      z__tr_stored_block
diff --git a/zconf.h.cmakein b/zconf.h.cmakein
index 5390baa..3c44906 100644
--- a/zconf.h.cmakein
+++ b/zconf.h.cmakein
@@ -23,6 +23,7 @@
 #  define _dist_code            z__dist_code
 #  define _length_code          z__length_code
 #  define _tr_align             z__tr_align
+#  define _tr_flush_bits        z__tr_flush_bits
 #  define _tr_flush_block       z__tr_flush_block
 #  define _tr_init              z__tr_init
 #  define _tr_stored_block      z__tr_stored_block
diff --git a/zconf.h.in b/zconf.h.in
index 26e7a04..97b3a70 100644
--- a/zconf.h.in
+++ b/zconf.h.in
@@ -21,6 +21,7 @@
 #  define _dist_code            z__dist_code
 #  define _length_code          z__length_code
 #  define _tr_align             z__tr_align
+#  define _tr_flush_bits        z__tr_flush_bits
 #  define _tr_flush_block       z__tr_flush_block
 #  define _tr_init              z__tr_init
 #  define _tr_stored_block      z__tr_stored_block