diff --git a/src/libcamera/base/log.cpp b/src/libcamera/base/log.cpp
index f26c8bfe..0921e548 100644
--- a/src/libcamera/base/log.cpp
+++ b/src/libcamera/base/log.cpp
@@ -236,8 +236,8 @@ void LogOutput::write(const LogMessage &msg)
 
 	switch (target_) {
 	case LoggingTargetSyslog:
-		str = std::string(log_severity_name(severity)) + " "
-		    + msg.category().name() + " " + msg.fileInfo() + " ";
+		str = std::string(log_severity_name(severity)) + ' '
+		    + msg.category().name() + ' ' + msg.fileInfo() + ' ';
 		if (!msg.prefix().empty())
 			str += msg.prefix() + ": ";
 		str += msg.msg();
@@ -245,11 +245,11 @@ void LogOutput::write(const LogMessage &msg)
 		break;
 	case LoggingTargetStream:
 	case LoggingTargetFile:
-		str = "[" + utils::time_point_to_string(msg.timestamp()) + "] ["
+		str = '[' + utils::time_point_to_string(msg.timestamp()) + "] ["
 		    + std::to_string(Thread::currentId()) + "] "
-		    + severityColor + log_severity_name(severity) + " "
-		    + categoryColor + msg.category().name() + " "
-		    + fileColor + msg.fileInfo() + " ";
+		    + severityColor + log_severity_name(severity) + ' '
+		    + categoryColor + msg.category().name() + ' '
+		    + fileColor + msg.fileInfo() + ' ';
 		if (!msg.prefix().empty())
 			str += prefixColor + msg.prefix() + ": ";
 		str += resetColor + msg.msg();
diff --git a/src/libcamera/media_pipeline.cpp b/src/libcamera/media_pipeline.cpp
index 3c551731..26c60c36 100644
--- a/src/libcamera/media_pipeline.cpp
+++ b/src/libcamera/media_pipeline.cpp
@@ -243,11 +243,11 @@ int MediaPipeline::init(MediaEntity *source, std::string_view sink)
 			       [](const Entity &e) {
 				       std::string s = "[";
 				       if (e.sink)
-					       s += std::to_string(e.sink->index()) + "|";
+					       s += std::to_string(e.sink->index()) + '|';
 				       s += e.entity->name();
 				       if (e.source)
-					       s += "|" + std::to_string(e.source->index());
-				       s += "]";
+					       s += '|' + std::to_string(e.source->index());
+				       s += ']';
 				       return s;
 			       });
 
diff --git a/src/libcamera/pipeline/simple/simple.cpp b/src/libcamera/pipeline/simple/simple.cpp
index 4a0b9f58..c2fe8351 100644
--- a/src/libcamera/pipeline/simple/simple.cpp
+++ b/src/libcamera/pipeline/simple/simple.cpp
@@ -578,11 +578,11 @@ SimpleCameraData::SimpleCameraData(SimplePipelineHandler *pipe,
 			       [](const Entity &e) {
 				       std::string s = "[";
 				       if (e.sink)
-					       s += std::to_string(e.sink->index()) + "|";
+					       s += std::to_string(e.sink->index()) + '|';
 				       s += e.entity->name();
 				       if (e.source)
-					       s += "|" + std::to_string(e.source->index());
-				       s += "]";
+					       s += '|' + std::to_string(e.source->index());
+				       s += ']';
 				       return s;
 			       });
 }