diff --git a/src/agg/process_text_symbolizer.cpp b/src/agg/process_text_symbolizer.cpp
index 5c16652af..9da346a48 100644
--- a/src/agg/process_text_symbolizer.cpp
+++ b/src/agg/process_text_symbolizer.cpp
@@ -35,7 +35,7 @@ void agg_renderer<T>::process(text_symbolizer const& sym,
     text_symbolizer_helper<face_manager<freetype_engine>,
         label_collision_detector4> helper(
             sym, *feature, prj_trans,
-            width_, height_,
+            detector_->extent().width(), detector_->extent().height(),
             scale_factor_,
             t_, font_manager_, *detector_, query_extent_);
 
diff --git a/src/grid/process_text_symbolizer.cpp b/src/grid/process_text_symbolizer.cpp
index 0587a9231..f943746c2 100644
--- a/src/grid/process_text_symbolizer.cpp
+++ b/src/grid/process_text_symbolizer.cpp
@@ -35,7 +35,7 @@ void grid_renderer<T>::process(text_symbolizer const& sym,
     text_symbolizer_helper<face_manager<freetype_engine>,
         label_collision_detector4> helper(
             sym, *feature, prj_trans,
-            width_, height_,
+            detector_.extent().width(), detector_.extent().height(),
             scale_factor_ * (1.0/pixmap_.get_resolution()),
             t_, font_manager_, detector_,
             query_extent);