diff --git a/compat/mingw.c b/compat/mingw.c
index d378cd04cb..6097b8f9e6 100644
--- a/compat/mingw.c
+++ b/compat/mingw.c
@@ -26,7 +26,6 @@ static const int delay[] = { 0, 1, 10, 20, 40 };
 void open_in_gdb(void)
 {
 	static struct child_process cp = CHILD_PROCESS_INIT;
-	extern char *_pgmptr;
 
 	strvec_pushl(&cp.args, "mintty", "gdb", NULL);
 	strvec_pushf(&cp.args, "--pid=%d", getpid());