diff --git a/Modules/_tkinter.c b/Modules/_tkinter.c
index 8cea7b59fe730e..9893ed53256920 100644
--- a/Modules/_tkinter.c
+++ b/Modules/_tkinter.c
@@ -235,7 +235,6 @@ static PyThread_type_lock tcl_lock = 0;
 
 #ifdef TCL_THREADS
 static Tcl_ThreadDataKey state_key;
-typedef PyThreadState *ThreadSpecificData;
 #define tcl_tstate \
     (*(PyThreadState**)Tcl_GetThreadData(&state_key, sizeof(PyThreadState*)))
 #else