diff --git a/libressl.spec b/libressl.spec
index 4b90c1d..3083c21 100644
--- a/libressl.spec
+++ b/libressl.spec
@@ -95,6 +95,7 @@ Source25:		test5.c
 Source29:		test9.c
 # To get %%_openssldir and for %%check
 BuildRequires:	openssl-devel
+BuildRequires:	pkgconfig(zlib)
 #BuildRequires(check)
 BuildRequires:	gostsum
 # readelf <...> | <...>