diff --git a/gfx/cairo/cairo/src/Makefile.in b/gfx/cairo/cairo/src/Makefile.in
index 708243b99195..a0991661209d 100644
--- a/gfx/cairo/cairo/src/Makefile.in
+++ b/gfx/cairo/cairo/src/Makefile.in
@@ -187,8 +187,6 @@ endif # GNU_CC
 
 DEFINES += -DPACKAGE_VERSION="\"moz\"" -DPACKAGE_BUGREPORT="\"http://bugzilla.mozilla.org/\""
 
-DEFINES += -DCAIRO_HAS_PTHREAD -D_GNU_SOURCE
-
 ifeq ($(MOZ_WIDGET_TOOLKIT),windows)
 DEFINES += -DCAIRO_WIN32_STATIC_BUILD
 endif
diff --git a/gfx/cairo/cairo/src/cairo-platform.h b/gfx/cairo/cairo/src/cairo-platform.h
index effb5000217b..eee2e712df7b 100644
--- a/gfx/cairo/cairo/src/cairo-platform.h
+++ b/gfx/cairo/cairo/src/cairo-platform.h
@@ -66,4 +66,6 @@
 #define FLOAT_WORDS_BIGENDIAN
 #endif
 
+#define CAIRO_NO_MUTEX 1
+
 #endif /* CAIRO_PLATFORM_H */