diff --git a/src/ipa/rpi/controller/rpi/ccm.cpp b/src/ipa/rpi/controller/rpi/ccm.cpp
index e673964c1856..aefa580c9a4b 100644
--- a/src/ipa/rpi/controller/rpi/ccm.cpp
+++ b/src/ipa/rpi/controller/rpi/ccm.cpp
@@ -113,8 +113,10 @@ void Ccm::initialise()
 {
 }
 
+namespace {
+
 template<typename T>
-static bool getLocked(Metadata *metadata, std::string const &tag, T &value)
+bool getLocked(Metadata *metadata, std::string const &tag, T &value)
 {
 	T *ptr = metadata->getLocked<T>(tag);
 	if (ptr == nullptr)
@@ -149,6 +151,8 @@ Matrix applySaturation(Matrix const &ccm, double saturation)
 	return Y2RGB * S * RGB2Y * ccm;
 }
 
+} /* namespace */
+
 void Ccm::prepare(Metadata *imageMetadata)
 {
 	bool awbOk = false, luxOk = false;
diff --git a/src/ipa/rpi/controller/rpi/contrast.cpp b/src/ipa/rpi/controller/rpi/contrast.cpp
index 9b37943ae9c9..fe866a544293 100644
--- a/src/ipa/rpi/controller/rpi/contrast.cpp
+++ b/src/ipa/rpi/controller/rpi/contrast.cpp
@@ -94,6 +94,8 @@ void Contrast::prepare(Metadata *imageMetadata)
 	imageMetadata->set("contrast.status", status_);
 }
 
+namespace {
+
 ipa::Pwl computeStretchCurve(Histogram const &histogram,
 			ContrastConfig const &config)
 {
@@ -153,6 +155,8 @@ ipa::Pwl applyManualContrast(ipa::Pwl const &gammaCurve, double brightness,
 	return newGammaCurve;
 }
 
+} /* namespace */
+
 void Contrast::process(StatisticsPtr &stats,
 		       [[maybe_unused]] Metadata *imageMetadata)
 {