diff --git a/src/nvimage/Filter.cpp b/src/nvimage/Filter.cpp
index 1b60b8c..aff3bdd 100644
--- a/src/nvimage/Filter.cpp
+++ b/src/nvimage/Filter.cpp
@@ -244,7 +244,7 @@ SincFilter::SincFilter(float w) : Filter(w) {}
 
 float SincFilter::evaluate(float x) const
 {
-	return 0.0f;
+	return sincf(PI * x);
 }