diff --git a/var/spack/repos/builtin/packages/dcap/package.py b/var/spack/repos/builtin/packages/dcap/package.py
index 97a560dcd9f..6be67d31a62 100644
--- a/var/spack/repos/builtin/packages/dcap/package.py
+++ b/var/spack/repos/builtin/packages/dcap/package.py
@@ -24,6 +24,9 @@ class Dcap(AutotoolsPackage):
     depends_on("libtool", type="build")
     depends_on("m4", type="build")
 
+    depends_on("openssl")
+    depends_on("zlib-api")
+
     variant("plugins", default=True, description="Build plugins")
 
     def patch(self):