diff --git a/src/c/symbols_list.h b/src/c/symbols_list.h
index 2c7810f46..56080722d 100644
--- a/src/c/symbols_list.h
+++ b/src/c/symbols_list.h
@@ -1552,8 +1552,10 @@ cl_symbols[] = {
 
 {SYS_ "*CODE-WALKER*", SI_SPECIAL, NULL, -1, OBJNULL},
 
+#ifdef ECL_DYNAMIC_FFI
 {SYS_ "CALL-CFUN", SI_ORDINARY, si_call_cfun, 4, OBJNULL},
 {KEY_ "CALLBACK", KEYWORD, NULL, -1, OBJNULL},
+#endif  /* ECL_DYNAMIC_FFI */
 
 /* Tag for end of list */
 {NULL, CL_ORDINARY, NULL, -1, OBJNULL}};
diff --git a/src/c/symbols_list2.h b/src/c/symbols_list2.h
index d6946aa19..6961a582e 100644
--- a/src/c/symbols_list2.h
+++ b/src/c/symbols_list2.h
@@ -1552,8 +1552,10 @@ cl_symbols[] = {
 
 {SYS_ "*CODE-WALKER*",NULL},
 
+#ifdef ECL_DYNAMIC_FFI
 {SYS_ "CALL-CFUN","si_call_cfun"},
 {KEY_ "CALLBACK",NULL},
+#endif  /* ECL_DYNAMIC_FFI */
 
 /* Tag for end of list */
 {NULL,NULL}};