diff --git a/libgcc/config/gthr-vxworks.c b/libgcc/config/gthr-vxworks.c
index 9b47ec8e9e9..4e73108d907 100644
--- a/libgcc/config/gthr-vxworks.c
+++ b/libgcc/config/gthr-vxworks.c
@@ -33,6 +33,7 @@ see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
 #if defined(__GTHREADS)
 
 #include <vxWorks.h>
+#include <taskLib.h>
 
 #ifndef __RTP__
 # include <vxLib.h>