diff --git a/boehm-gc/ChangeLog b/boehm-gc/ChangeLog
index eaef529ba80..60eac094906 100644
--- a/boehm-gc/ChangeLog
+++ b/boehm-gc/ChangeLog
@@ -1,3 +1,9 @@
+2007-10-10  John David Anglin  <dave.anglin@nrc-cnrc.gc.ca>
+
+	PR boehm-gc/33442
+	* pthread_support.c (GC_PTR GC_get_thread_stack_base): If stack grows
+	up, return stack_addr instead of stack_addr - stack_size.
+
 2007-08-14  David Daney  <ddaney@avtrex.com>
 
 	* include/private/gcconfig.h: Handle mips64-linux n64 ABI.
diff --git a/boehm-gc/pthread_support.c b/boehm-gc/pthread_support.c
index 8210357766c..57c8a16a1fa 100644
--- a/boehm-gc/pthread_support.c
+++ b/boehm-gc/pthread_support.c
@@ -1153,7 +1153,7 @@ GC_PTR GC_get_thread_stack_base()
 #   ifdef STACK_GROWS_DOWN
       return stack_addr + stack_size;
 #   else
-      return stack_addr - stack_size;
+      return stack_addr;
 #   endif
 
 # else