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-rw-r--r--src/multihistogram.h3
1 files changed, 2 insertions, 1 deletions
diff --git a/src/multihistogram.h b/src/multihistogram.h
index e4c2ae89..0949d259 100644
--- a/src/multihistogram.h
+++ b/src/multihistogram.h
@@ -40,7 +40,8 @@ extern MultiHistogram *multihistogram_new();
extern void multihistogram_free(MultiHistogram *hi);
extern void multihistogram_delete_all_values(MultiHistogram *hi);
-extern void multihistogram_add_value(MultiHistogram *hi, double val, int cat);
+extern void multihistogram_add_value(MultiHistogram *hi, double val,
+ unsigned int cat);
extern void multihistogram_set_min(MultiHistogram *hi, double min);
extern void multihistogram_set_max(MultiHistogram *hi, double max);