diff --git a/sys/include/net/gcoap.h b/sys/include/net/gcoap.h
index b9b4afebdd..264da5a188 100644
--- a/sys/include/net/gcoap.h
+++ b/sys/include/net/gcoap.h
@@ -622,12 +622,13 @@ extern "C" {
  * @brief Stack size for module thread
  * @{
  */
-#ifndef GCOAP_STACK_SIZE
+#ifndef GCOAP_DTLS_EXTRA_STACKSIZE
 #if IS_USED(MODULE_GCOAP_DTLS)
 #define GCOAP_DTLS_EXTRA_STACKSIZE  (THREAD_STACKSIZE_DEFAULT)
 #else
 #define GCOAP_DTLS_EXTRA_STACKSIZE  (0)
 #endif
+#endif
 
 /**
  * @brief Extra stack for VFS operations
@@ -639,6 +640,7 @@ extern "C" {
 #define GCOAP_VFS_EXTRA_STACKSIZE   (0)
 #endif
 
+#ifndef GCOAP_STACK_SIZE
 #define GCOAP_STACK_SIZE (THREAD_STACKSIZE_DEFAULT + DEBUG_EXTRA_STACKSIZE \
                           + sizeof(coap_pkt_t) + GCOAP_DTLS_EXTRA_STACKSIZE \
                           + GCOAP_VFS_EXTRA_STACKSIZE)