diff --git a/src/formats.rs b/src/formats.rs
index 96fdbf5..aeb61e4 100644
--- a/src/formats.rs
+++ b/src/formats.rs
@@ -136,12 +136,12 @@ pub trait FormatSteps {
 
 		// sort errors so unreadable files appear before files with unknown mimetypes - ScanError impls Ord such that
 		// ScanError::File > ScanError::Mime
-		let errors = entries.iter().filter_map(|e| e.as_ref().err()).sorted();
+		let errors = entries.iter().filter_map(|e| e.as_ref().err()).sorted_unstable();
 		// sort files so that files with no known extension come before those with known extensions - None > Some("jpg")
 		let findings = entries
 			.iter()
 			.filter_map(|e| e.as_ref().ok())
-			.sorted_by(|a, b| b.recommended_extension().cmp(&a.recommended_extension()).reverse());
+			.sorted_unstable_by(|a, b| b.recommended_extension().cmp(&a.recommended_extension()).reverse());
 
 		for error in errors {
 			match error {
@@ -343,8 +343,16 @@ impl Format for Json {
 		let result = serde_json::to_writer_pretty(
 			f,
 			&SerdeEntries {
-				errors: &entries.iter().filter_map(|e| e.as_ref().err()).sorted().collect(),
-				findings: &entries.iter().filter_map(|f| f.as_ref().ok()).sorted().collect(),
+				errors: &entries
+					.iter()
+					.filter_map(|e| e.as_ref().err())
+					.sorted_unstable()
+					.collect(),
+				findings: &entries
+					.iter()
+					.filter_map(|f| f.as_ref().ok())
+					.sorted_unstable()
+					.collect(),
 			},
 		);