diff --git a/configure/CONFIG_BASE b/configure/CONFIG_BASE
index 185f9e0e2..85479227b 100644
--- a/configure/CONFIG_BASE
+++ b/configure/CONFIG_BASE
@@ -56,6 +56,12 @@ CXX_EXCEPTIONS_FLAGS_YES =
 CXX_EXCEPTIONS_FLAGS_NO = -DnoExceptionsFromCXX
 EPICS_BASE_CPPFLAGS = $(CXX_EXCEPTIONS_FLAGS_$(CXX_EXCEPTIONS))
 
+# osithread default stack
+OSITHREAD_USE_DEFAULT_STACK = YES
+OSITHREAD_DEFAULT_STACK_FLAGS_YES = -DOSITHREAD_USE_DEFAULT_STACK
+OSITHREAD_DEFAULT_STACK_FLAGS_NO =
+EPICS_BASE_CPPFLAGS += $(OSITHREAD_DEFAULT_STACK_FLAGS_$(OSITHREAD_USE_DEFAULT_STACK))
+
 #---------------------------------------------------------------
 # Epics base build tools and tool flags