diff --git a/internal/formats/spdx22json/to_format_model.go b/internal/formats/spdx22json/to_format_model.go
index 6d8e47ea61e..d1f3d3d4678 100644
--- a/internal/formats/spdx22json/to_format_model.go
+++ b/internal/formats/spdx22json/to_format_model.go
@@ -112,8 +112,10 @@ func fileIDsForPackage(packageSpdxID string, relationships []artifact.Relationsh
 			continue
 		}
 
-		if string(relationship.From.ID()) == packageSpdxID {
-			fileIDs = append(fileIDs, string(relationship.To.ID()))
+		from := model.ElementID(relationship.From.ID()).String()
+		to := model.ElementID(relationship.To.ID()).String()
+		if from == packageSpdxID {
+			fileIDs = append(fileIDs, to)
 		}
 	}
 	return fileIDs
diff --git a/internal/formats/spdx22json/to_format_model_test.go b/internal/formats/spdx22json/to_format_model_test.go
index d1f5da9a860..ee4c1ed1144 100644
--- a/internal/formats/spdx22json/to_format_model_test.go
+++ b/internal/formats/spdx22json/to_format_model_test.go
@@ -188,7 +188,7 @@ func Test_fileIDsForPackage(t *testing.T) {
 	}{
 		{
 			name: "find file IDs for packages with package-file relationships",
-			id:   string(p.ID()),
+			id:   model.ElementID(p.ID()).String(),
 			relationships: []artifact.Relationship{
 				{
 					From: p,
@@ -197,12 +197,12 @@ func Test_fileIDsForPackage(t *testing.T) {
 				},
 			},
 			expected: []string{
-				string(c.ID()),
+				model.ElementID(c.ID()).String(),
 			},
 		},
 		{
 			name: "ignore package-to-package",
-			id:   string(p.ID()),
+			id:   model.ElementID(p.ID()).String(),
 			relationships: []artifact.Relationship{
 				{
 					From: p,
@@ -214,7 +214,7 @@ func Test_fileIDsForPackage(t *testing.T) {
 		},
 		{
 			name: "ignore file-to-file",
-			id:   string(p.ID()),
+			id:   model.ElementID(p.ID()).String(),
 			relationships: []artifact.Relationship{
 				{
 					From: c,
@@ -226,7 +226,7 @@ func Test_fileIDsForPackage(t *testing.T) {
 		},
 		{
 			name: "ignore file-to-package",
-			id:   string(p.ID()),
+			id:   model.ElementID(p.ID()).String(),
 			relationships: []artifact.Relationship{
 				{
 					From: c,
@@ -238,7 +238,7 @@ func Test_fileIDsForPackage(t *testing.T) {
 		},
 		{
 			name: "filter by relationship type",
-			id:   string(p.ID()),
+			id:   model.ElementID(p.ID()).String(),
 			relationships: []artifact.Relationship{
 				{
 					From: p,