diff --git a/t/flow.t b/t/flow.t
index 80fc12c5e..071d290c8 100644
--- a/t/flow.t
+++ b/t/flow.t
@@ -34,7 +34,8 @@ use Slic3r::Test;
         }
     });
     my $E_per_mm_avg = sum(@E_per_mm) / @E_per_mm;
-    ok !(defined first { abs($_ - $E_per_mm_avg) > 0.01 } @E_per_mm),
+    # allow some tolerance because solid rectilinear infill might be adjusted/stretched
+    ok !(defined first { abs($_ - $E_per_mm_avg) > 0.015 } @E_per_mm),
         'first_layer_extrusion_width applies to everything on first layer';
 }
 
diff --git a/t/pressure.t b/t/pressure.t
index fd9045c82..a819da79c 100644
--- a/t/pressure.t
+++ b/t/pressure.t
@@ -29,7 +29,7 @@ use Slic3r::Test;
         }
     });
     
-    ok abs($retracted) < epsilon, 'all retractions are compensated';
+    ok abs($retracted) < 0.0002, 'all retractions are compensated';
 }
 
 
diff --git a/t/shells.t b/t/shells.t
index a133e1d33..a12858ae0 100644
--- a/t/shells.t
+++ b/t/shells.t
@@ -143,6 +143,7 @@ use Slic3r::Test;
     $config->set('top_solid_layers', 3);
     $config->set('solid_infill_speed', 99);
     $config->set('top_solid_infill_speed', 99);
+    $config->set('bridge_speed', 99);
     
     my $print = Slic3r::Test::init_print('sloping_hole', config => $config);
     my %solid_layers = ();  # Z => 1