1 files changed, 1 insertions, 1 deletions
diff --git a/base/histogram.h b/base/histogram.h
index 140bdd2..63d734b 100644
--- a/base/histogram.h
+++ b/base/histogram.h
@@ -350,7 +350,7 @@ class LinearHistogram : public Histogram {
  public:
   struct DescriptionPair {
     Sample sample;
-    char* description;  // Null means end of a list of pairs.
+    const char* description;  // Null means end of a list of pairs.
   };
   LinearHistogram(const wchar_t* name, Sample minimum,
             Sample maximum, size_t bucket_count);