diff --git a/scheme/cyclone/cps-opt-analyze-call-graph.scm b/scheme/cyclone/cps-opt-analyze-call-graph.scm
index 4e896aab..effcf87e 100644
--- a/scheme/cyclone/cps-opt-analyze-call-graph.scm
+++ b/scheme/cyclone/cps-opt-analyze-call-graph.scm
@@ -20,7 +20,8 @@
             (srfi 2)
             (srfi 69)
             )
-    ))
+    )
+  (else #f))
 
 ;; symbol -> hash-table -> boolean
 ;; Is it OK to inline code replacing ref, based on call graph data from lookup table?
@@ -261,4 +262,5 @@
     ;  (ast:ast->pp-sexp
     ;    (opt:local-var-reduction (ast:sexp->ast sexp)))
     ;)
-))
+)
+(else #f))
diff --git a/scheme/cyclone/cps-opt-local-var-redux.scm b/scheme/cyclone/cps-opt-local-var-redux.scm
index be573f4d..9e81206f 100644
--- a/scheme/cyclone/cps-opt-local-var-redux.scm
+++ b/scheme/cyclone/cps-opt-local-var-redux.scm
@@ -14,7 +14,9 @@
             (scheme cyclone ast) 
             (scheme cyclone primitives)
             (scheme cyclone util) 
-            (scheme cyclone pretty-print))))
+            (scheme cyclone pretty-print)))
+  (else
+    #f))
 
 ;; Local variable reduction:
 ;; Reduce given sexp by replacing certain lambda calls with a let containing
@@ -434,4 +436,5 @@
       (ast:ast->pp-sexp
         (opt:local-var-reduction (ast:sexp->ast sexp)))
     )
-    ))
+    )
+  (else #f))
diff --git a/scheme/cyclone/cps-opt-memoize-pure-fncs.scm b/scheme/cyclone/cps-opt-memoize-pure-fncs.scm
index 1b096394..6b36f34d 100644
--- a/scheme/cyclone/cps-opt-memoize-pure-fncs.scm
+++ b/scheme/cyclone/cps-opt-memoize-pure-fncs.scm
@@ -18,9 +18,9 @@
             (scheme cyclone util) 
             (scheme cyclone pretty-print)
             (srfi 2)
-            (srfi 69)
-            )
-    ))
+            (srfi 69)))
+  (else
+    #f))
 
 ;; Predicate to determine if a function can be memoized
 ;; var - symbol - global name of the function
@@ -371,4 +371,5 @@
 ;;    ;  (ast:ast->pp-sexp
 ;;    ;    (opt:local-var-reduction (ast:sexp->ast sexp)))
 ;;    ;)
-))
+)
+(else #f))
diff --git a/scheme/cyclone/pass-validate-syntax.scm b/scheme/cyclone/pass-validate-syntax.scm
index 74689670..af150026 100644
--- a/scheme/cyclone/pass-validate-syntax.scm
+++ b/scheme/cyclone/pass-validate-syntax.scm
@@ -14,7 +14,8 @@
       (scheme base)
       (scheme read)
       (scheme cyclone pretty-print)
-      (scheme cyclone util))))
+      (scheme cyclone util)))
+   (else #f))
 ;;
 ;; TODO: call this from cyclone.scm after it works, probably after "resolve macros"
 
@@ -59,7 +60,9 @@
   (define (search exp vars)
     (cond-expand
       (program
-        (pretty-print `(search ,exp ,vars))(newline))) ;; Debugging
+        (pretty-print `(search ,exp ,vars))(newline)) ;; Debugging
+      (else
+        #f))
     (cond
       ;((ast:lambda? exp) 'TODO)
       ((const? exp) #f)
@@ -111,4 +114,5 @@
     ;(if 1 2 3 4)
     
      (let ((sexp (read-all (open-input-file "validation.scm"))))
-      (validate-keyword-syntax sexp))))
+      (validate-keyword-syntax sexp)))
+  (else #f))