diff --git a/internal/model1/helpers.go b/internal/model1/helpers.go
index fb0ac597a7..e1664940c5 100644
--- a/internal/model1/helpers.go
+++ b/internal/model1/helpers.go
@@ -50,7 +50,7 @@ func IsValid(ns string, h Header, r Row) bool {
 		return true
 	}
 
-	return strings.TrimSpace(r.Fields[idx]) == ""
+	return strings.TrimSpace(r.Fields[idx]) == "" || strings.ToLower(strings.TrimSpace(r.Fields[idx])) == "true"
 }
 
 func sortLabels(m map[string]string) (keys, vals []string) {
diff --git a/internal/model1/helpers_test.go b/internal/model1/helpers_test.go
index 3e6a04272f..f3db189439 100644
--- a/internal/model1/helpers_test.go
+++ b/internal/model1/helpers_test.go
@@ -53,6 +53,55 @@ func TestLabelize(t *testing.T) {
 	}
 }
 
+func TestIsValid(t *testing.T) {
+
+	uu := map[string]struct {
+		ns string
+		h  Header
+		r  Row
+		e  bool
+	}{
+		"empty": {
+			ns: "blee",
+			h:  Header{},
+			r:  Row{},
+			e:  true,
+		},
+		"valid": {
+			ns: "blee",
+			h:  Header{HeaderColumn{Name: "VALID"}},
+			r:  Row{Fields: Fields{"true"}},
+			e:  true,
+		},
+		"invalid": {
+			ns: "blee",
+			h:  Header{HeaderColumn{Name: "VALID"}},
+			r:  Row{Fields: Fields{"false"}},
+			e:  false,
+		},
+		"valid_capital_case": {
+			ns: "blee",
+			h:  Header{HeaderColumn{Name: "VALID"}},
+			r:  Row{Fields: Fields{"True"}},
+			e:  true,
+		},
+		"valid_all_caps": {
+			ns: "blee",
+			h:  Header{HeaderColumn{Name: "VALID"}},
+			r:  Row{Fields: Fields{"TRUE"}},
+			e:  true,
+		},
+	}
+
+	for k, u := range uu {
+		t.Run(k, func(t *testing.T) {
+			valid := IsValid(u.ns, u.h, u.r)
+			assert.Equal(t, u.e, valid)
+		})
+	}
+
+}
+
 func TestDurationToSecond(t *testing.T) {
 	uu := map[string]struct {
 		s string