diff --git a/cig/cig.scm b/cig/cig.scm
index 31ad5dd..b12aff6 100644
--- a/cig/cig.scm
+++ b/cig/cig.scm
@@ -167,6 +167,8 @@
 
  ;; extensions by JMG for the new FFI
  (time_t  #("time_t ~a" 	  integer?   "s48_extract_integer"	#f))
+ (clock_t #("clock_t ~a"	  integer?   "s48_extract_fixnum"	#f))
+ (ssize_t #("ssize_t ~a"	  integer?   "s48_extract_fixnum"	#f))
 
  (desc		 #("s48_value ~a"	#f	 "" #f))
  (string-desc	 #("s48_value ~a"	string?	 "" #f))
@@ -218,6 +220,9 @@
 
  ; Extension by JMG with the new FFI
  (time_t  #("time_t ~a"		 "s48_enter_integer" #f #f #f))
+ (clock_t #("clock_t ~a"	 "s48_enter_fixnum" #f #f #f))
+ (ssize_t #("ssize_t ~a"	 "s48_enter_fixnum" #f #f #f))
+
 
  (desc		 #("s48_value ~a" "" #f #f #f))
  (string-desc	 #("s48_value ~a" "" #f #f #f))