diff --git a/src/ipa/libipa/histogram.cpp b/src/ipa/libipa/histogram.cpp
index 10e44b54a0cf..c19a4cbbf3cd 100644
--- a/src/ipa/libipa/histogram.cpp
+++ b/src/ipa/libipa/histogram.cpp
@@ -130,7 +130,8 @@ double Histogram::quantile(double q, uint32_t first, uint32_t last) const
 	if (cumulative_[first + 1] == cumulative_[first])
 		frac = 0;
 	else
-		frac = (item - cumulative_[first]) / (cumulative_[first + 1] - cumulative_[first]);
+		frac = (q * total() - cumulative_[first]) /
+		       (cumulative_[first + 1] - cumulative_[first]);
 	return first + frac;
 }