diff --git a/gfx/cairo/libpixman/src/pixman-private.h b/gfx/cairo/libpixman/src/pixman-private.h
index 43ff77b4976..903d026f827 100644
--- a/gfx/cairo/libpixman/src/pixman-private.h
+++ b/gfx/cairo/libpixman/src/pixman-private.h
@@ -11,7 +11,7 @@
 #define LOWER_QUALITY_INTERPOLATION
 #define BILINEAR_INTERPOLATION_BITS 4
 #else
-#define BILINEAR_INTERPOLATION_BITS 8
+#define BILINEAR_INTERPOLATION_BITS 7
 #endif
 #define BILINEAR_INTERPOLATION_RANGE (1 << BILINEAR_INTERPOLATION_BITS)