diff --git a/libxml.spec.in b/libxml.spec.in
index 8d13a18..2fc4a6f 100644
--- a/libxml.spec.in
+++ b/libxml.spec.in
@@ -26,6 +26,7 @@
 Summary: Libraries, includes, etc. to develop XML and HTML applications
 Group: Development/Libraries
 Requires: libxml2 = %{version}
+Requires: zlib-devel
 
 %description devel
 Libraries, include files, etc you can use to develop XML applications.