diff --git a/.changelog/11927.txt b/.changelog/11927.txt
new file mode 100644
index 000000000000..86a212935bca
--- /dev/null
+++ b/.changelog/11927.txt
@@ -0,0 +1,4 @@
+```
+release-note:bug
+Fixed a bug where connect sidecar resources were ignored when using HCL1
+```
diff --git a/jobspec/parse_service.go b/jobspec/parse_service.go
index c4c1d33d8780..fe679805bd32 100644
--- a/jobspec/parse_service.go
+++ b/jobspec/parse_service.go
@@ -104,12 +104,10 @@ func parseService(o *ast.ObjectItem) (*api.Service, error) {
 		if len(co.Items) > 1 {
 			return nil, fmt.Errorf("connect '%s': cannot have more than 1 connect stanza", service.Name)
 		}
-
 		c, err := parseConnect(co.Items[0])
 		if err != nil {
 			return nil, multierror.Prefix(err, fmt.Sprintf("'%s',", service.Name))
 		}
-
 		service.Connect = c
 	}
 
@@ -191,33 +189,29 @@ func parseConnect(co *ast.ObjectItem) (*api.ConsulConnect, error) {
 
 	// Parse the sidecar_service
 	o = connectList.Filter("sidecar_service")
-	if len(o.Items) == 0 {
-		return &connect, nil
-	}
 	if len(o.Items) > 1 {
 		return nil, fmt.Errorf("only one 'sidecar_service' block allowed per task")
 	}
-
-	r, err := parseSidecarService(o.Items[0])
-	if err != nil {
-		return nil, fmt.Errorf("sidecar_service, %v", err)
+	if len(o.Items) == 1 {
+		r, err := parseSidecarService(o.Items[0])
+		if err != nil {
+			return nil, fmt.Errorf("sidecar_service, %v", err)
+		}
+		connect.SidecarService = r
 	}
-	connect.SidecarService = r
 
 	// Parse the sidecar_task
 	o = connectList.Filter("sidecar_task")
-	if len(o.Items) == 0 {
-		return &connect, nil
-	}
 	if len(o.Items) > 1 {
 		return nil, fmt.Errorf("only one 'sidecar_task' block allowed per task")
 	}
-
-	t, err := parseSidecarTask(o.Items[0])
-	if err != nil {
-		return nil, fmt.Errorf("sidecar_task, %v", err)
+	if len(o.Items) == 1 {
+		t, err := parseSidecarTask(o.Items[0])
+		if err != nil {
+			return nil, fmt.Errorf("sidecar_task, %v", err)
+		}
+		connect.SidecarTask = t
 	}
-	connect.SidecarTask = t
 
 	return &connect, nil
 }
diff --git a/jobspec/parse_test.go b/jobspec/parse_test.go
index 63cac85dfd78..aa219c1172eb 100644
--- a/jobspec/parse_test.go
+++ b/jobspec/parse_test.go
@@ -1285,6 +1285,30 @@ func TestParse(t *testing.T) {
 			},
 			false,
 		},
+		{
+			"tg-service-connect-resources.hcl",
+			&api.Job{
+				ID:   stringToPtr("sidecar_task_resources"),
+				Name: stringToPtr("sidecar_task_resources"),
+				Type: stringToPtr("service"),
+				TaskGroups: []*api.TaskGroup{{
+					Name: stringToPtr("group"),
+					Services: []*api.Service{{
+						Name: "example",
+						Connect: &api.ConsulConnect{
+							SidecarTask: &api.SidecarTask{
+								Resources: &api.Resources{
+									CPU:         intToPtr(111),
+									MemoryMB:    intToPtr(222),
+									MemoryMaxMB: intToPtr(333),
+								},
+							},
+						},
+					}},
+				}},
+			},
+			false,
+		},
 		{
 			"tg-service-connect-proxy.hcl",
 			&api.Job{
diff --git a/jobspec/test-fixtures/tg-service-connect-resources.hcl b/jobspec/test-fixtures/tg-service-connect-resources.hcl
new file mode 100644
index 000000000000..166c17fb9cd9
--- /dev/null
+++ b/jobspec/test-fixtures/tg-service-connect-resources.hcl
@@ -0,0 +1,20 @@
+job "sidecar_task_resources" {
+  type = "service"
+
+  group "group" {
+    service {
+      name = "example"
+
+      connect {
+        # should still work without sidecar_service being set (i.e. connect gateway)
+        sidecar_task {
+          resources {
+            cpu        = 111
+            memory     = 222
+            memory_max = 333
+          }
+        }
+      }
+    }
+  }
+}