correct X86_DISPATCH_FUNCTION_SIZE if THREADS is defined
diff --git a/src/mesa/glapi/glapi.c b/src/mesa/glapi/glapi.c
index 6d35c03..d60570c 100644
--- a/src/mesa/glapi/glapi.c
+++ b/src/mesa/glapi/glapi.c
@@ -502,7 +502,7 @@
 #ifdef USE_X86_ASM
 extern const GLubyte gl_dispatch_functions_start[];
 
-# if defined(PTHREADS)
+# if defined(THREADS)
 #  define X86_DISPATCH_FUNCTION_SIZE  32
 # else
 #  define X86_DISPATCH_FUNCTION_SIZE  16