diff --git a/rootfs/etc/nginx/lua/balancer/sticky.lua b/rootfs/etc/nginx/lua/balancer/sticky.lua
index 6f0aef2a9..366ee6d32 100644
--- a/rootfs/etc/nginx/lua/balancer/sticky.lua
+++ b/rootfs/etc/nginx/lua/balancer/sticky.lua
@@ -103,8 +103,18 @@ local function pick_new_upstream(self)
 end
 
 local function should_set_cookie(self)
-  if self.cookie_session_affinity.locations then
+  if self.cookie_session_affinity.locations and ngx.var.host then
     local locs = self.cookie_session_affinity.locations[ngx.var.host]
+    if locs == nil then
+      -- Based off of wildcard hostname in ../certificate.lua
+      local wildcard_host, _, err = ngx.re.sub(ngx.var.host, "^[^\\.]+\\.", "*.", "jo")
+      if err then
+        ngx.log(ngx.ERR, "error: ", err);
+      elseif wildcard_host then
+        locs = self.cookie_session_affinity.locations[wildcard_host]
+      end
+    end
+
     if locs ~= nil then
       for _, path in pairs(locs) do
         if ngx.var.location_path == path then
diff --git a/rootfs/etc/nginx/lua/test/balancer/sticky_test.lua b/rootfs/etc/nginx/lua/test/balancer/sticky_test.lua
index b0e0cc30e..0c8b3297d 100644
--- a/rootfs/etc/nginx/lua/test/balancer/sticky_test.lua
+++ b/rootfs/etc/nginx/lua/test/balancer/sticky_test.lua
@@ -141,6 +141,41 @@ describe("Sticky", function()
       end)
     end)
 
+    context("when client doesn't have a cookie set and cookie_locations contains a matching wildcard location", function()
+      before_each(function ()
+        ngx.var.host = "dev.test.com"
+      end)
+      after_each(function ()
+        ngx.var.host = "test.com"
+      end)
+
+      it("sets a cookie on the client", function()
+        local s = {}
+        cookie.new = function(self)
+          local cookie_instance = {
+            set = function(self, payload)
+              assert.equal(payload.key, test_backend.sessionAffinityConfig.cookieSessionAffinity.name)
+              assert.equal(payload.path, ngx.var.location_path)
+              assert.equal(payload.domain, nil)
+              assert.equal(payload.httponly, true)
+              assert.equal(payload.secure, false)
+              return true, nil
+            end,
+            get = function(k) return false end,
+          }
+          s = spy.on(cookie_instance, "set")
+          return cookie_instance, false
+        end
+
+        local b = get_test_backend()
+        b.sessionAffinityConfig.cookieSessionAffinity.locations = {}
+        b.sessionAffinityConfig.cookieSessionAffinity.locations["*.test.com"] = {"/"}
+        local sticky_balancer_instance = sticky:new(b)
+        assert.has_no.errors(function() sticky_balancer_instance:balance() end)
+        assert.spy(s).was_called()
+      end)
+    end)
+
     context("when client doesn't have a cookie set and location not in cookie_locations", function()
       it("picks an endpoint for the client", function()
         local sticky_balancer_instance = sticky:new(test_backend)