diff --git a/uthread.cpp b/uthread.cpp
index e865c92..2054d4e 100644
--- a/uthread.cpp
+++ b/uthread.cpp
@@ -78,7 +78,7 @@ int uthread_create(schedule_t &schedule,Fun func,void *arg)
     getcontext(&(t->ctx));
     
     t->ctx.uc_stack.ss_sp = t->stack;
-    t->ctx.uc_stack.ss_size = DEFAULT_STACK_SZIE;
+    t->ctx.uc_stack.ss_size = DEFAULT_STACK_SIZE;
     t->ctx.uc_stack.ss_flags = 0;
     t->ctx.uc_link = &(schedule.main);
     schedule.running_thread = id;
diff --git a/uthread.h b/uthread.h
index ce955a9..402ee45 100644
--- a/uthread.h
+++ b/uthread.h
@@ -19,7 +19,7 @@
 #include <ucontext.h>
 #include <vector>
 
-#define DEFAULT_STACK_SZIE (1024*128)
+#define DEFAULT_STACK_SIZE (1024*128)
 #define MAX_UTHREAD_SIZE   1024
 
 enum ThreadState{FREE,RUNNABLE,RUNNING,SUSPEND};
@@ -34,7 +34,7 @@ typedef struct uthread_t
     Fun func;
     void *arg;
     enum ThreadState state;
-    char stack[DEFAULT_STACK_SZIE];
+    char stack[DEFAULT_STACK_SIZE];
 }uthread_t;
 
 typedef struct schedule_t