--- a/include/fluent-bit/flb_coro.h
+++ b/include/fluent-bit/flb_coro.h
@@ -62,9 +62,7 @@
     void *data;
 };
 
-#ifdef FLB_CORO_STACK_SIZE
-#define FLB_CORO_STACK_SIZE      FLB_CORO_STACK_SIZE
-#else
+#ifndef FLB_CORO_STACK_SIZE
 #define FLB_CORO_STACK_SIZE      ((3 * PTHREAD_STACK_MIN) / 2)
 #endif