1 files changed, 1 insertions, 1 deletions
diff --git a/src/2geom/sbasis.cpp b/src/2geom/sbasis.cpp
index bdc40c936..b5c1a05a7 100644
--- a/src/2geom/sbasis.cpp
+++ b/src/2geom/sbasis.cpp
@@ -70,7 +70,7 @@ std::vector<double> SBasis::valueAndDerivatives(double t, unsigned n) const {
     SBasis tmp = *this;
     for(unsigned i = 1; i < n+1; i++) {
         tmp.derive();
-        ret[i+1] = tmp.valueAt(t);
+        ret[i] = tmp.valueAt(t);
     }
     return ret;
 }