diff --git a/cmd/scan.go b/cmd/scan.go
index 06d8c6c25..9c92de966 100644
--- a/cmd/scan.go
+++ b/cmd/scan.go
@@ -123,6 +123,9 @@ func parseTargets(targetsStr string) ([]scanner.ScanTarget, error) {
 		if err != nil {
 			return nil, fmt.Errorf("invalid library ID %q: %w", libIDStr, err)
 		}
+		if libID <= 0 {
+			return nil, fmt.Errorf("invalid library ID %q", libIDStr)
+		}
 
 		targets = append(targets, scanner.ScanTarget{
 			LibraryID:  libID,
diff --git a/cmd/scan_test.go b/cmd/scan_test.go
index 2844d2ed8..c8dce51d6 100644
--- a/cmd/scan_test.go
+++ b/cmd/scan_test.go
@@ -68,10 +68,10 @@ var _ = Describe("parseTargets", func() {
 			Expect(err.Error()).To(ContainSubstring("invalid library ID"))
 		})
 
-		It("handles negative library ID", func() {
-			targets, err := parseTargets("-1:Music")
-			Expect(err).ToNot(HaveOccurred()) // Actually valid - strconv.Atoi accepts negative numbers
-			Expect(targets[0].LibraryID).To(Equal(-1))
+		It("return error on negative library ID", func() {
+			_, err := parseTargets("-1:Music")
+			Expect(err).To(HaveOccurred())
+			Expect(err.Error()).To(ContainSubstring("invalid library ID"))
 		})
 
 		It("handles only whitespace", func() {