diff --git a/src/h/config.h.in b/src/h/config.h.in
index 534b3f155..658f6feb3 100644
--- a/src/h/config.h.in
+++ b/src/h/config.h.in
@@ -73,17 +73,8 @@
 /* Use Boehm's garbage collector					*/
 #undef GBC_BOEHM
 #ifdef GBC_BOEHM
-# ifdef ECL_WINDOWS_THREADS
-#   define GC_WIN32_THREADS	/* For older versions */
+# ifdef ECL_THREADS
 #   define GC_THREADS		/* For >= 7.2 */
-# else
-#  ifdef ECL_THREADS
-#    define GC_PTHREADS		/* For older versions */
-#    define GC_THREADS		/* For >= 7.2 */
-#    ifdef __APPLE__		/* For older versions */
-#      define GC_DARWIN_THREADS
-#    endif
-#  endif
 # endif
 # define ECL_DYNAMIC_VV
 # include "@ECL_BOEHM_GC_HEADER@"