diff --git a/zconf.h b/zconf.h
index 5e1d68a..5953d7d 100644
--- a/zconf.h
+++ b/zconf.h
@@ -130,6 +130,7 @@
 #    define uncompress2           z_uncompress2
 #  endif
 #  define zError                z_zError
+#  define z_errmsg              z_z_errmsg
 #  ifndef Z_SOLO
 #    define zcalloc               z_zcalloc
 #    define zcfree                z_zcfree
diff --git a/zconf.h.cmakein b/zconf.h.cmakein
index a7f24cc..7658ad4 100644
--- a/zconf.h.cmakein
+++ b/zconf.h.cmakein
@@ -132,6 +132,7 @@
 #    define uncompress2           z_uncompress2
 #  endif
 #  define zError                z_zError
+#  define z_errmsg              z_z_errmsg
 #  ifndef Z_SOLO
 #    define zcalloc               z_zcalloc
 #    define zcfree                z_zcfree
diff --git a/zconf.h.in b/zconf.h.in
index 5e1d68a..5953d7d 100644
--- a/zconf.h.in
+++ b/zconf.h.in
@@ -130,6 +130,7 @@
 #    define uncompress2           z_uncompress2
 #  endif
 #  define zError                z_zError
+#  define z_errmsg              z_z_errmsg
 #  ifndef Z_SOLO
 #    define zcalloc               z_zcalloc
 #    define zcfree                z_zcfree