diff --git a/pkgs/tools/video/rtmpdump/default.nix b/pkgs/tools/video/rtmpdump/default.nix
index de26cc41d74..29f2a1c448d 100644
--- a/pkgs/tools/video/rtmpdump/default.nix
+++ b/pkgs/tools/video/rtmpdump/default.nix
@@ -26,7 +26,7 @@ stdenv.mkDerivation rec {
     ++ optional stdenv.isDarwin "SYS=darwin"
     ++ optional stdenv.cc.isClang "CC=clang";
 
-  buildInputs = [ zlib ]
+  propagatedBuildInputs = [ zlib ]
     ++ optional gnutlsSupport gnutls
     ++ optional opensslSupport openssl;