diff --git a/help.c b/help.c
index 92bfef140b..84770b3571 100644
--- a/help.c
+++ b/help.c
@@ -766,6 +766,9 @@ void get_version_info(struct strbuf *buf, int show_build_options)
 #endif
 #if defined OPENSSL_VERSION_TEXT
 		strbuf_addf(buf, "OpenSSL: %s\n", OPENSSL_VERSION_TEXT);
+#endif
+#if defined ZLIB_VERSION
+		strbuf_addf(buf, "zlib: %s\n", ZLIB_VERSION);
 #endif
 	}
 }