diff --git a/filebeat/autodiscover/builder/hints/logs.go b/filebeat/autodiscover/builder/hints/logs.go
index 8685776b1502..5707f61cfef9 100644
--- a/filebeat/autodiscover/builder/hints/logs.go
+++ b/filebeat/autodiscover/builder/hints/logs.go
@@ -186,7 +186,7 @@ func (l *logHints) getFilesets(hints common.MapStr, module string) map[string]*f
 
 	moduleFilesets, err := l.Registry.ModuleFilesets(module)
 	if err != nil {
-		logp.Err("Error retrieving module filesets", err)
+		logp.Err("Error retrieving module filesets: %+v", err)
 		return nil
 	}
 
diff --git a/filebeat/input/log/input.go b/filebeat/input/log/input.go
index afba5fb42202..cc8d575f8a8d 100644
--- a/filebeat/input/log/input.go
+++ b/filebeat/input/log/input.go
@@ -510,7 +510,7 @@ func (p *Input) harvestExistingFile(newState file.State, oldState file.State) {
 
 	// File size was reduced -> truncated file
 	if oldState.Finished && newState.Fileinfo.Size() < oldState.Offset {
-		logp.Debug("input", "Old file was truncated. Starting from the beginning: %s, offset: %d, new size: %d ", newState.Source, newState.Fileinfo.Size())
+		logp.Debug("input", "Old file was truncated. Starting from the beginning: %s, offset: %d, new size: %d ", newState.Source, oldState.Offset, newState.Fileinfo.Size())
 		err := p.startHarvester(newState, 0)
 		if err != nil {
 			logp.Err("Harvester could not be started on truncated file: %s, Err: %s", newState.Source, err)
diff --git a/filebeat/reader/readfile/line.go b/filebeat/reader/readfile/line.go
index be2714b498f1..a2656884868d 100644
--- a/filebeat/reader/readfile/line.go
+++ b/filebeat/reader/readfile/line.go
@@ -87,7 +87,7 @@ func (r *LineReader) Next() ([]byte, int, error) {
 		if buf[len(buf)-1] == '\n' {
 			break
 		} else {
-			logp.Debug("line", "Line ending char found which wasn't one: %s", buf[len(buf)-1])
+			logp.Debug("line", "Line ending char found which wasn't one: %s", string(buf[len(buf)-1]))
 		}
 	}