diff --git a/Ports/ntbtls/package.sh b/Ports/ntbtls/package.sh
index 1d26b683d35..b7358c82969 100755
--- a/Ports/ntbtls/package.sh
+++ b/Ports/ntbtls/package.sh
@@ -4,7 +4,7 @@ version=0.2.0
 useconfigure=true
 use_fresh_config_sub=true
 config_sub_path=build-aux/config.sub
-depends=("libgpg-error" "libksba" "libgcrypt")
+depends=("libgpg-error" "libksba" "libgcrypt" "zlib")
 files="https://gnupg.org/ftp/gcrypt/ntbtls/ntbtls-${version}.tar.bz2 ntbtls-${version}.tar.bz2 649fe74a311d13e43b16b26ebaa91665ddb632925b73902592eac3ed30519e17"
 auth_type=sha256