diff --git a/legacy/gcc/gcc/config/i386/haiku.h b/legacy/gcc/gcc/config/i386/haiku.h
index 34037325be..5508fbb2ab 100644
--- a/legacy/gcc/gcc/config/i386/haiku.h
+++ b/legacy/gcc/gcc/config/i386/haiku.h
@@ -163,7 +163,7 @@ Boston, MA 02111-1307, USA.  */
 -Asystem(haiku)"
 
 #undef CPP_SPEC
-#define CPP_SPEC "%(cpp_cpu) %{!fno-pic:%{!fno-PIC:-D__PIC__ -D__pic__}}"
+#define CPP_SPEC "%(cpp_cpu) %{!fno-pic:%{!fno-PIC:-D__PIC__ -D__pic__}} %{pthread:}"
 
 /* Haiku uses lots of multichars, so don't warn about them unless the
    user explicitly asks for the warnings with -Wmultichar.  Note that