diff --git a/src/ipa/libipa/awb.h b/src/ipa/libipa/awb.h
index 4a1b012a4..5c298d3b6 100644
--- a/src/ipa/libipa/awb.h
+++ b/src/ipa/libipa/awb.h
@@ -35,7 +35,7 @@ public:
 	virtual ~AwbAlgorithm() = default;
 
 	virtual int init(const YamlObject &tuningData) = 0;
-	virtual AwbResult calculateAwb(const AwbStats &stats, int lux) = 0;
+	virtual AwbResult calculateAwb(const AwbStats &stats, unsigned int lux) = 0;
 	virtual RGB<double> gainsFromColourTemperature(double colourTemperature) = 0;
 
 	const ControlInfoMap::Map &controls() const
diff --git a/src/ipa/libipa/awb_bayes.cpp b/src/ipa/libipa/awb_bayes.cpp
index e75bfcd69..9287b884c 100644
--- a/src/ipa/libipa/awb_bayes.cpp
+++ b/src/ipa/libipa/awb_bayes.cpp
@@ -275,7 +275,7 @@ RGB<double> AwbBayes::gainsFromColourTemperature(double colourTemperature)
 	return { { gains[0], 1.0, gains[1] } };
 }
 
-AwbResult AwbBayes::calculateAwb(const AwbStats &stats, int lux)
+AwbResult AwbBayes::calculateAwb(const AwbStats &stats, unsigned int lux)
 {
 	ipa::Pwl prior;
 	if (lux > 0) {
diff --git a/src/ipa/libipa/awb_bayes.h b/src/ipa/libipa/awb_bayes.h
index 47db72432..23bf88061 100644
--- a/src/ipa/libipa/awb_bayes.h
+++ b/src/ipa/libipa/awb_bayes.h
@@ -34,7 +34,7 @@ public:
 	AwbBayes() = default;
 
 	int init(const YamlObject &tuningData) override;
-	AwbResult calculateAwb(const AwbStats &stats, int lux) override;
+	AwbResult calculateAwb(const AwbStats &stats, unsigned int lux) override;
 	RGB<double> gainsFromColourTemperature(double temperatureK) override;
 	void handleControls(const ControlList &controls) override;
 
diff --git a/src/ipa/libipa/awb_grey.cpp b/src/ipa/libipa/awb_grey.cpp
index 06ffd4561..e979cc4d1 100644
--- a/src/ipa/libipa/awb_grey.cpp
+++ b/src/ipa/libipa/awb_grey.cpp
@@ -70,7 +70,7 @@ int AwbGrey::init(const YamlObject &tuningData)
  *
  * \return The AWB result
  */
-AwbResult AwbGrey::calculateAwb(const AwbStats &stats, [[maybe_unused]] int lux)
+AwbResult AwbGrey::calculateAwb(const AwbStats &stats, [[maybe_unused]] unsigned int lux)
 {
 	AwbResult result;
 	auto means = stats.getRGBMeans();
diff --git a/src/ipa/libipa/awb_grey.h b/src/ipa/libipa/awb_grey.h
index 1a365e616..e3c34201d 100644
--- a/src/ipa/libipa/awb_grey.h
+++ b/src/ipa/libipa/awb_grey.h
@@ -23,7 +23,7 @@ public:
 	AwbGrey() = default;
 
 	int init(const YamlObject &tuningData) override;
-	AwbResult calculateAwb(const AwbStats &stats, int lux) override;
+	AwbResult calculateAwb(const AwbStats &stats, unsigned int lux) override;
 	RGB<double> gainsFromColourTemperature(double colourTemperature) override;
 
 private: