diff --git a/src/st/st-theme-node.c b/src/st/st-theme-node.c
index 9aedc3ba1..7acb5708c 100644
--- a/src/st/st-theme-node.c
+++ b/src/st/st-theme-node.c
@@ -1021,7 +1021,8 @@ get_length_from_term (StThemeNode *node,
 
   if (term->type != TERM_NUMBER)
     {
-      g_warning ("Ignoring length property that isn't a number");
+      g_warning ("Ignoring length property that isn't a number at line %d, col %d",
+                 term->location.line, term->location.column);
       return VALUE_NOT_FOUND;
     }