# if !defined(THREADS) || defined(GC_PTHREADS) || defined(GC_WIN32_THREADS) \
|| defined(GC_SOLARIS_THREADS)
if (GC_stackbottom == 0) {
- # ifdef GC_PTHREADS
+ # if defined(GC_PTHREADS) && ! defined(GC_SOLARIS_THREADS)
/* Use thread_stack_base if available, as GC could be initialized from
a thread that is not the "main" thread. */
GC_stackbottom = GC_get_thread_stack_base();