diff --git a/source/blender/editors/animation/keyframes_general.cc b/source/blender/editors/animation/keyframes_general.cc
index dc5ec85806a..6110fc8963d 100644
--- a/source/blender/editors/animation/keyframes_general.cc
+++ b/source/blender/editors/animation/keyframes_general.cc
@@ -614,9 +614,11 @@ void smooth_fcurve_segment(FCurve *fcu,
                            double *kernel)
 {
   const int segment_end_index = segment->start_index + segment->length;
-  const int segment_start_x = fcu->bezt[segment->start_index].vec[1][0];
+  const float segment_start_x = fcu->bezt[segment->start_index].vec[1][0];
   for (int i = segment->start_index; i < segment_end_index; i++) {
-    const int sample_index = (int)(fcu->bezt[i].vec[1][0] - segment_start_x) + kernel_size;
+    /* Using round() instead of (int). The latter would create stepping on x-values that are just
+     * below a full frame. */
+    const int sample_index = round(fcu->bezt[i].vec[1][0] - segment_start_x) + kernel_size;
     /* Apply the kernel. */
     double filter_result = samples[sample_index] * kernel[0];
     for (int j = 1; j <= kernel_size; j++) {