diff --git a/src/ipa/libipa/histogram.cpp b/src/ipa/libipa/histogram.cpp
index 4d94571f9..d8ad1c892 100644
--- a/src/ipa/libipa/histogram.cpp
+++ b/src/ipa/libipa/histogram.cpp
@@ -32,7 +32,7 @@ namespace ipa {
  * \brief Create a cumulative histogram
  * \param[in] data A pre-sorted histogram to be passed
  */
-Histogram::Histogram(Span<uint32_t> data)
+Histogram::Histogram(Span<const uint32_t> data)
 {
 	cumulative_.reserve(data.size());
 	cumulative_.push_back(0);
diff --git a/src/ipa/libipa/histogram.h b/src/ipa/libipa/histogram.h
index c40a366bb..164d46033 100644
--- a/src/ipa/libipa/histogram.h
+++ b/src/ipa/libipa/histogram.h
@@ -22,7 +22,7 @@ namespace ipa {
 class Histogram
 {
 public:
-	Histogram(Span<uint32_t> data);
+	Histogram(Span<const uint32_t> data);
 	size_t bins() const { return cumulative_.size() - 1; }
 	uint64_t total() const { return cumulative_[cumulative_.size() - 1]; }
 	uint64_t cumulativeFrequency(double bin) const;