diff --git a/gfx/cairo/cairo/src/moz.build b/gfx/cairo/cairo/src/moz.build
index c78758a06b..bc16dff18f 100644
--- a/gfx/cairo/cairo/src/moz.build
+++ b/gfx/cairo/cairo/src/moz.build
@@ -110,7 +110,7 @@ SOURCES += [
     'cairo-surface-wrapper.c', #  redefinition of '_copy_transformed_pattern'
 ]
 
-UNIFIED_SOURCES += [
+SOURCES += [
     'cairo-analysis-surface.c',
     'cairo-arc.c',
     'cairo-array.c',