diff --git a/gtk/gtkcssshadowvalue.c b/gtk/gtkcssshadowvalue.c
index fead476c00..49f1f84ca5 100644
--- a/gtk/gtkcssshadowvalue.c
+++ b/gtk/gtkcssshadowvalue.c
@@ -336,10 +336,10 @@ gtk_css_shadow_value_new_filter (const GtkCssValue *other)
   ShadowValue value;
 
   value.inset = FALSE;
-  value.hoffset = _gtk_css_number_value_new (0, GTK_CSS_NUMBER);
-  value.voffset = _gtk_css_number_value_new (0, GTK_CSS_NUMBER);
-  value.radius = _gtk_css_number_value_new (0, GTK_CSS_NUMBER);
-  value.spread = _gtk_css_number_value_new (0, GTK_CSS_NUMBER);
+  value.hoffset = _gtk_css_number_value_new (0, GTK_CSS_PX);
+  value.voffset = _gtk_css_number_value_new (0, GTK_CSS_PX);
+  value.radius = _gtk_css_number_value_new (0, GTK_CSS_PX);
+  value.spread = _gtk_css_number_value_new (0, GTK_CSS_PX);
   value.color = gtk_css_value_ref (other->shadows[0].color);
 
   return gtk_css_shadow_value_new (&value, 1, TRUE);