diff --git a/var/spack/repos/builtin/packages/r-signac/package.py b/var/spack/repos/builtin/packages/r-signac/package.py
index 112d565650f..75b59709a46 100644
--- a/var/spack/repos/builtin/packages/r-signac/package.py
+++ b/var/spack/repos/builtin/packages/r-signac/package.py
@@ -46,3 +46,4 @@ class RSignac(RPackage):
     depends_on("r-rcpp", type=("build", "run"))
     depends_on("r-tidyselect", type=("build", "run"))
     depends_on("r-vctrs", type=("build", "run"))
+    depends_on("zlib")