diff --git a/rtl/win/wininc/defines.inc b/rtl/win/wininc/defines.inc
index 7ec6a16b60..cb002d888f 100644
--- a/rtl/win/wininc/defines.inc
+++ b/rtl/win/wininc/defines.inc
@@ -651,6 +651,7 @@
      CREATE_NEW_PROCESS_GROUP = 512;
      CREATE_SEPARATE_WOW_VDM = 2048;
      CREATE_SUSPENDED = 4;
+     STACK_SIZE_PARAM_IS_A_RESERVATION = $10000;
      CREATE_UNICODE_ENVIRONMENT = 1024;
      DEBUG_PROCESS = 1;
      DEBUG_ONLY_THIS_PROCESS = 2;
diff --git a/rtl/wince/wininc/defines.inc b/rtl/wince/wininc/defines.inc
index 6c85a5d130..c3e9ea337e 100644
--- a/rtl/wince/wininc/defines.inc
+++ b/rtl/wince/wininc/defines.inc
@@ -616,6 +616,7 @@
      CREATE_NEW_PROCESS_GROUP = 512;
      CREATE_SEPARATE_WOW_VDM = 2048;
      CREATE_SUSPENDED = 4;
+     STACK_SIZE_PARAM_IS_A_RESERVATION = 0; // Disabling this, it needs in fact to be checked
      CREATE_UNICODE_ENVIRONMENT = 1024;
      DEBUG_PROCESS = 1;
      DEBUG_ONLY_THIS_PROCESS = 2;