diff --git a/lib/default.nix b/lib/default.nix
index 7865310..6c25c4e 100644
--- a/lib/default.nix
+++ b/lib/default.nix
@@ -141,6 +141,7 @@ rec {
 
       # Completion
       cmp-buffer
+      cmp-calc
       cmp-cmdline
       cmp-nvim-lsp
       cmp-path
diff --git a/plugin/completion.lua b/plugin/completion.lua
index e0abadc..049dd92 100644
--- a/plugin/completion.lua
+++ b/plugin/completion.lua
@@ -32,6 +32,7 @@ cmp.setup {
   sources = {
     { name = "nvim_lsp" },
     { name = "nvim_lua" },
+    { name = "calc" },
     { name = "luasnip" },
   },