diff --git a/ext/thread/thread.c b/ext/thread/thread.c
index 1a517c5b8a..7d0dab8c29 100644
--- a/ext/thread/thread.c
+++ b/ext/thread/thread.c
@@ -511,7 +511,7 @@ void
 Init_thread(void)
 {
 #if UNDER_THREAD
-#define ALIAS_GLOBCAL_CONST(name) do {	              \
+#define ALIAS_GLOBAL_CONST(name) do {	              \
 	ID id = rb_intern_const(#name);	              \
 	if (!rb_const_defined_at(rb_cObject, id)) {   \
 	    rb_const_set(rb_cObject, id, rb_c##name); \
@@ -519,7 +519,7 @@ Init_thread(void)
     } while (0)
 #define OUTER rb_cThread
 #else
-#define ALIAS_GLOBCAL_CONST(name) do { /* nothing */ } while (0)
+#define ALIAS_GLOBAL_CONST(name) do { /* nothing */ } while (0)
 #define OUTER 0
 #endif
 
@@ -569,7 +569,7 @@ Init_thread(void)
     rb_alias(rb_cSizedQueue, rb_intern("shift"), rb_intern("pop"));
 
     rb_provide("thread.rb");
-    ALIAS_GLOBCAL_CONST(ConditionVariable);
-    ALIAS_GLOBCAL_CONST(Queue);
-    ALIAS_GLOBCAL_CONST(SizedQueue);
+    ALIAS_GLOBAL_CONST(ConditionVariable);
+    ALIAS_GLOBAL_CONST(Queue);
+    ALIAS_GLOBAL_CONST(SizedQueue);
 }