diff --git a/src/ipa/rkisp1/algorithms/agc.cpp b/src/ipa/rkisp1/algorithms/agc.cpp
index 0f60d08fd41c..9dac60bdb24e 100644
--- a/src/ipa/rkisp1/algorithms/agc.cpp
+++ b/src/ipa/rkisp1/algorithms/agc.cpp
@@ -84,7 +84,8 @@ int Agc::parseMeteringModes(IPAContext &context, const YamlObject &tuningData)
 	return 0;
 }
 
-uint8_t Agc::computeHistogramPredivider(Size &size, enum rkisp1_cif_isp_histogram_mode mode)
+uint8_t Agc::computeHistogramPredivider(const Size &size,
+					enum rkisp1_cif_isp_histogram_mode mode)
 {
 	/*
 	 * The maximum number of pixels that could potentially be in one bin is
diff --git a/src/ipa/rkisp1/algorithms/agc.h b/src/ipa/rkisp1/algorithms/agc.h
index 996fea71755c..9ceaa82b099e 100644
--- a/src/ipa/rkisp1/algorithms/agc.h
+++ b/src/ipa/rkisp1/algorithms/agc.h
@@ -45,7 +45,7 @@ public:
 
 private:
 	int parseMeteringModes(IPAContext &context, const YamlObject &tuningData);
-	uint8_t computeHistogramPredivider(Size &size,
+	uint8_t computeHistogramPredivider(const Size &size,
 					   enum rkisp1_cif_isp_histogram_mode mode);
 
 	void fillMetadata(IPAContext &context, IPAFrameContext &frameContext,