diff --git a/src/libslic3r/LayerRegion.cpp b/src/libslic3r/LayerRegion.cpp
index 6017f393e..073907c8c 100644
--- a/src/libslic3r/LayerRegion.cpp
+++ b/src/libslic3r/LayerRegion.cpp
@@ -378,7 +378,7 @@ void LayerRegion::process_external_surfaces(const Layer *lower_layer, const Poly
         const double custom_angle = this->region().config().bridge_angle.value;
         const auto   params = Algorithm::RegionExpansionParameters::build(expansion_bottom_bridge, expansion_step, max_nr_expansion_steps);
         bridges.surfaces = custom_angle > 0 ?
-            expand_merge_surfaces(m_fill_surfaces.surfaces, stBottomBridge, shells, params, custom_angle) :
+            expand_merge_surfaces(m_fill_surfaces.surfaces, stBottomBridge, shells, params, Geometry::deg2rad(custom_angle)) :
             expand_bridges_detect_orientations(m_fill_surfaces.surfaces, shells, params);
         BOOST_LOG_TRIVIAL(trace) << "Processing external surface, detecting bridges - done";
 #if 0