diff --git a/AK/Compiler.h b/AK/Compiler.h
index 74abc1a4e8..78e43498e7 100644
--- a/AK/Compiler.h
+++ b/AK/Compiler.h
@@ -2,6 +2,7 @@
 
 #define PACKED __attribute__ ((packed))
 #define NORETURN __attribute__ ((noreturn))
+#define FLATTEN __attribute__ ((flatten))
 #undef ALWAYS_INLINE
 #define ALWAYS_INLINE inline __attribute__ ((always_inline))
 #define NEVER_INLINE __attribute__ ((noinline))
diff --git a/SharedGraphics/Painter.cpp b/SharedGraphics/Painter.cpp
index f171aa7793..725b791420 100644
--- a/SharedGraphics/Painter.cpp
+++ b/SharedGraphics/Painter.cpp
@@ -182,7 +182,7 @@ void Painter::draw_bitmap(const Point& p, const CharacterBitmap& bitmap, Color c
     }
 }
 
-void Painter::draw_glyph(const Point& point, char ch, Color color)
+FLATTEN void Painter::draw_glyph(const Point& point, char ch, Color color)
 {
     draw_bitmap(point, font().glyph_bitmap(ch), color);
 }