diff --git a/src/ipa/rpi/controller/rpi/awb.cpp b/src/ipa/rpi/controller/rpi/awb.cpp
index f45525bc..c5750c84 100644
--- a/src/ipa/rpi/controller/rpi/awb.cpp
+++ b/src/ipa/rpi/controller/rpi/awb.cpp
@@ -505,7 +505,7 @@ static double interpolateQuadatric(ipa::Pwl::Point const &a, ipa::Pwl::Point con
 	const double eps = 1e-3;
 	ipa::Pwl::Point ca = c - a, ba = b - a;
 	double denominator = 2 * (ba.y() * ca.x() - ca.y() * ba.x());
-	if (abs(denominator) > eps) {
+	if (fabs(denominator) > eps) {
 		double numerator = ba.y() * ca.x() * ca.x() - ca.y() * ba.x() * ba.x();
 		double result = numerator / denominator + a.x();
 		return std::max(a.x(), std::min(c.x(), result));