diff --git a/components/gfx/paint_task.rs b/components/gfx/paint_task.rs
index 42d629cd82e..53cae38df18 100644
--- a/components/gfx/paint_task.rs
+++ b/components/gfx/paint_task.rs
@@ -587,8 +587,8 @@ impl WorkerThread {
             let mut buffer = layer_buffer.unwrap();
             draw_target.snapshot().get_data_surface().with_data(|data| {
                 buffer.native_surface.upload(native_graphics_context!(self), data);
-                debug!("painting worker thread uploading to native surface {:d}",
-                       buffer.native_surface.get_id() as int);
+                debug!("painting worker thread uploading to native surface {}",
+                       buffer.native_surface.get_id());
             });
             return buffer
         }
diff --git a/components/gfx/platform/freetype/font.rs b/components/gfx/platform/freetype/font.rs
index 5896a335585..109d4754637 100644
--- a/components/gfx/platform/freetype/font.rs
+++ b/components/gfx/platform/freetype/font.rs
@@ -255,7 +255,7 @@ impl FontHandleMethods for FontHandle {
             line_gap:         height,
         };
 
-        debug!("Font metrics (@{:f} pt): {}", geometry::to_pt(em_size), metrics);
+        debug!("Font metrics (@{} pt): {}", geometry::to_pt(em_size), metrics);
         return metrics;
     }
 
diff --git a/components/gfx/text/shaping/harfbuzz.rs b/components/gfx/text/shaping/harfbuzz.rs
index 4cf0575dbee..6e10384615b 100644
--- a/components/gfx/text/shaping/harfbuzz.rs
+++ b/components/gfx/text/shaping/harfbuzz.rs
@@ -307,7 +307,7 @@ impl Shaper {
         debug!("text: {}", text);
         debug!("(char idx): char->(glyph index):");
         for (i, ch) in text.char_indices() {
-            debug!("{}: {} --> {:d}", i, ch, *byte_to_glyph.get(i).unwrap() as int);
+            debug!("{}: {} --> {}", i, ch, byte_to_glyph[i]);
         }
 
         // some helpers