diff --git a/cpprest.changes b/cpprest.changes
index 419162b..99b2589 100644
--- a/cpprest.changes
+++ b/cpprest.changes
@@ -1,3 +1,8 @@
+-------------------------------------------------------------------
+Mon May 20 12:52:29 UTC 2019 - Christophe Giboudeaux <christophe@krop.fr>
+
+- Add the missing zlib requirement.
+
 -------------------------------------------------------------------
 Sat Apr 27 18:43:50 UTC 2019 - Andreas Stieger <andreas.stieger@gmx.de>
 
diff --git a/cpprest.spec b/cpprest.spec
index d515072..32f11d9 100644
--- a/cpprest.spec
+++ b/cpprest.spec
@@ -36,6 +36,7 @@ BuildRequires:  cmake >= 3.0
 BuildRequires:  gcc-c++
 BuildRequires:  openssl-devel >= 1.0
 BuildRequires:  pkgconfig(websocketpp) >= 0.8
+BuildRequires:  pkgconfig(zlib)
 %if 0%{?suse_version} > 1325
 BuildRequires:  libboost_atomic-devel
 BuildRequires:  libboost_filesystem-devel