diff --git a/BUILD.gn b/BUILD.gn
index 8303c9f..f2fca44 100644
--- a/BUILD.gn
+++ b/BUILD.gn
@@ -338,7 +338,7 @@
 
   libs = [
     "launchpad",
-    "magenta",
+    "zircon",
   ]
 
   configs += [ ":sbase_config" ]
diff --git a/rules.mk b/rules.mk
index d3b3802..2182f99 100644
--- a/rules.mk
+++ b/rules.mk
@@ -107,7 +107,7 @@
     xinstall \
     yes \
 
-THIRD_PARTY_SBASE_LIBS := system/ulib/mxio system/ulib/c
+THIRD_PARTY_SBASE_LIBS := system/ulib/fdio system/ulib/c
 
 THIRD_PARTY_SBASE_CFLAGS := \
     -Wno-sign-compare \
@@ -130,6 +130,6 @@
 
 $(foreach pgm,$(SBASE_PROGRAMS),$(call make-sbase-program,$(pgm)))
 
-THIRD_PARTY_SBASE_LIBS := system/ulib/launchpad system/ulib/magenta system/ulib/mxio system/ulib/c
+THIRD_PARTY_SBASE_LIBS := system/ulib/launchpad system/ulib/zircon system/ulib/fdio system/ulib/c
 
 $(call make-sbase-program,xargs)
diff --git a/xargs.c b/xargs.c
index 242a318..5c69768 100644
--- a/xargs.c
+++ b/xargs.c
@@ -138,7 +138,7 @@
 
 #ifdef __Fuchsia__
 #include <launchpad/launchpad.h>
-#include <magenta/syscalls.h>
+#include <zircon/syscalls.h>
 
 static void
 launch_and_wait(const char* fn, char* const argv[])
@@ -150,15 +150,15 @@
 
 	launchpad_t* lp;
 	launchpad_create(0, fn, &lp);
-	int nofile = (launchpad_load_from_file(lp, fn) != MX_OK);
+	int nofile = (launchpad_load_from_file(lp, fn) != ZX_OK);
 	launchpad_set_args(lp, argc, (void*) argv);
 	launchpad_clone(lp, LP_CLONE_ALL);
 
-	mx_handle_t proc;
-	mx_status_t status = launchpad_go(lp, &proc, NULL);
+	zx_handle_t proc;
+	zx_status_t status = launchpad_go(lp, &proc, NULL);
 
-	if (status == MX_OK) {
-		mx_object_wait_one(proc, MX_PROCESS_TERMINATED, MX_TIME_INFINITE, NULL);
+	if (status == ZX_OK) {
+		zx_object_wait_one(proc, ZX_PROCESS_TERMINATED, ZX_TIME_INFINITE, NULL);
 	} else {
 		errno = nofile ? ENOENT : EIO;
 		weprintf("execvp %s:", *cmd);