diff --git a/libavfilter/tests/drawvg.c b/libavfilter/tests/drawvg.c
index 2d151bf4d2..9fb233d969 100644
--- a/libavfilter/tests/drawvg.c
+++ b/libavfilter/tests/drawvg.c
@@ -167,7 +167,7 @@ void cairo_set_source(cairo_t *cr, cairo_pattern_t *source) {
     printf("%s", __func__);
 
 #define PRINT_COLOR(prefix) \
-    printf(prefix "#%02x%02x%02x%02x", (int)(r*255), (int)(g*255), (int)(b*255), (int)(a*255))
+    printf(prefix "#%02lx%02lx%02lx%02lx", lround(r*255), lround(g*255), lround(b*255), lround(a*255))
 
     switch (cairo_pattern_get_type(source)) {
     case CAIRO_PATTERN_TYPE_SOLID:
diff --git a/libavfilter/vf_drawvg.c b/libavfilter/vf_drawvg.c
index fd9270ee13..5d3008084c 100644
--- a/libavfilter/vf_drawvg.c
+++ b/libavfilter/vf_drawvg.c
@@ -1981,7 +1981,7 @@ static int vgs_eval(
                 b = numerics[3];
             }
 
-            #define C(v, o) ((uint32_t)(av_clipd(v, 0, 1) * 255) << o)
+            #define C(v, o) ((uint32_t)lround(av_clipd(v, 0, 1) * 255) << o)
 
             state->vars[user_var] = (double)(
                 C(r, 24)
diff --git a/tests/ref/fate/filter-drawvg-interpreter b/tests/ref/fate/filter-drawvg-interpreter
index 21c6ccd848..3fc33e9c07 100644
--- a/tests/ref/fate/filter-drawvg-interpreter
+++ b/tests/ref/fate/filter-drawvg-interpreter
@@ -64,16 +64,16 @@ cairo_set_dash [ -1.0 ] 4.0
 cairo_set_dash [ ] 0.0
 cairo_move_to 1.0 2.0
 cairo_rel_line_to -1.0 -2.0
-cairo_set_source #19334c66
+cairo_set_source #1a334d66
 cairo_set_fill_rule 0
 cairo_fill
-cairo_set_source #475b3d66
+cairo_set_source #475c3d66
 cairo_set_fill_rule 0
 cairo_fill
-cairo_set_source #7f99b2cc
+cairo_set_source #8099b3cc
 cairo_set_fill_rule 0
 cairo_fill
-cairo_set_source #a8d7efe5
+cairo_set_source #a8d8f0e6
 cairo_set_fill_rule 0
 cairo_fill
 cairo_rel_line_to 1.0 3.0