diff --git a/Changes b/Changes
index 6a3527fc18..a357b5da20 100644
--- a/Changes
+++ b/Changes
@@ -1,7 +1,10 @@
 10.5.x.x (relative to 10.5.9.2)
 ========
 
+Fixes
+-----
 
+- IECoreScene.CurvesPrimitiveEvaluator.Result : Fixed error in `vTangent()` function causing tangent to point in opposite direction for curves with `Linear` interpolation.
 
 
 10.5.9.2 (relative to 10.5.9.1)
diff --git a/src/IECoreScene/CurvesPrimitiveEvaluator.cpp b/src/IECoreScene/CurvesPrimitiveEvaluator.cpp
index 91148cdf2e..6eddf07dad 100644
--- a/src/IECoreScene/CurvesPrimitiveEvaluator.cpp
+++ b/src/IECoreScene/CurvesPrimitiveEvaluator.cpp
@@ -260,8 +260,8 @@ void CurvesPrimitiveEvaluator::Result::init( unsigned curveIndex, float v, const
 	{
 		m_coefficients[0] = 1.0f - m_segmentV;
 		m_coefficients[1] = m_segmentV;
-		m_derivativeCoefficients[0] = 1.0f;
-		m_derivativeCoefficients[1] = -1.0f;
+		m_derivativeCoefficients[0] = -1.0f;
+		m_derivativeCoefficients[1] = 1.0f;
 		m_vertexDataIndices[0] = m_varyingDataIndices[0] = o + i;
 		if( periodic )
 		{