diff --git a/Ports/libpng/package.sh b/Ports/libpng/package.sh
index b931579b05f..2e23c48f123 100755
--- a/Ports/libpng/package.sh
+++ b/Ports/libpng/package.sh
@@ -4,3 +4,4 @@ version=1.6.37
 useconfigure=true
 files="https://download.sourceforge.net/libpng/libpng-${version}.tar.gz libpng-${version}.tar.gz"
 workdir="libpng-$version"
+depends="zlib"