diff --git a/libvips/resample/snohalo1.cpp b/libvips/resample/snohalo1.cpp
index e81ae885..56a11912 100644
--- a/libvips/resample/snohalo1.cpp
+++ b/libvips/resample/snohalo1.cpp
@@ -1123,4 +1123,5 @@ vips_interpolate_snohalo1_class_init( VipsInterpolateSnohalo1Class *klass )
 static void
 vips_interpolate_snohalo1_init( VipsInterpolateSnohalo1 *snohalo1 )
 {
+	snohalo1->blur = 1.0;
 }