diff --git a/pkg/ulimit/ulimit.go b/pkg/ulimit/ulimit.go
index 2375315e3e..eb2ae4e8c7 100644
--- a/pkg/ulimit/ulimit.go
+++ b/pkg/ulimit/ulimit.go
@@ -102,5 +102,5 @@ func (u *Ulimit) GetRlimit() (*Rlimit, error) {
 }
 
 func (u *Ulimit) String() string {
-	return fmt.Sprintf("%s=%s:%s", u.Name, u.Soft, u.Hard)
+	return fmt.Sprintf("%s=%d:%d", u.Name, u.Soft, u.Hard)
 }
diff --git a/pkg/ulimit/ulimit_test.go b/pkg/ulimit/ulimit_test.go
index 419b5e0407..593918aa39 100644
--- a/pkg/ulimit/ulimit_test.go
+++ b/pkg/ulimit/ulimit_test.go
@@ -39,3 +39,10 @@ func TestParseInvalidValueType(t *testing.T) {
 		t.Fatal("expected error on bad value type")
 	}
 }
+
+func TestStringOutput(t *testing.T) {
+	u := &Ulimit{"nofile", 1024, 512}
+	if s := u.String(); s != "nofile=512:1024" {
+		t.Fatal("expected String to return nofile=512:1024, but got", s)
+	}
+}