diff --git a/src/ipa/simple/black_level.cpp b/src/ipa/simple/black_level.cpp
index cc490eb5..37e0109c 100644
--- a/src/ipa/simple/black_level.cpp
+++ b/src/ipa/simple/black_level.cpp
@@ -15,6 +15,8 @@ namespace libcamera {
 
 LOG_DEFINE_CATEGORY(IPASoftBL)
 
+namespace ipa::soft {
+
 /**
  * \class BlackLevel
  * \brief Object providing black point level for software ISP
@@ -85,4 +87,7 @@ void BlackLevel::update(SwIspStats::Histogram &yHistogram)
 		}
 	};
 }
+
+} /* namespace ipa::soft */
+
 } /* namespace libcamera */
diff --git a/src/ipa/simple/black_level.h b/src/ipa/simple/black_level.h
index 5e032f9f..a04230c9 100644
--- a/src/ipa/simple/black_level.h
+++ b/src/ipa/simple/black_level.h
@@ -14,6 +14,8 @@
 
 namespace libcamera {
 
+namespace ipa::soft {
+
 class BlackLevel
 {
 public:
@@ -26,4 +28,6 @@ private:
 	bool blackLevelSet_;
 };
 
+} /* namespace ipa::soft */
+
 } /* namespace libcamera */