diff --git a/src/Makefile b/src/Makefile
index 72fabc4..cc7694a 100644
--- a/src/Makefile
+++ b/src/Makefile
@@ -195,9 +195,9 @@ MEMBERS-PRINT-SOURCES=members-print.scm util-dict-list.import.scm		\
 members-print.o: members-print.import.scm
 members-print.import.scm: $(MEMBERS-PRINT-SOURCES)
 
-MEMBERS-FEES-SOURCES=members-fees.scm configuration.import.scm		\
+MEMBERS-FEES-SOURCES=members-fees.scm configuration.import.scm	\
 	brmember.import.scm month.import.scm table.import.scm	\
-	members-base.import.scm
+	members-base.import.scm specification.import.scm
 
 members-fees.o: members-fees.import.scm
 members-fees.import.scm: $(MEMBERS-FEES-SOURCES)
@@ -346,7 +346,7 @@ LOGGING-SOURCES=logging.scm util-string.import.scm
 logging.o: logging.import.scm
 logging.import.scm: $(LOGGING-SOURCES)
 
-SPECIFICATION-SOURCES=specification.scm
+SPECIFICATION-SOURCES=specification.scm period.import.scm
 
 specification.o: specification.import.scm
 specification.import.scm: $(SPECIFICATION-SOURCES)
diff --git a/src/members-fees.scm b/src/members-fees.scm
index d519669..5547b47 100644
--- a/src/members-fees.scm
+++ b/src/members-fees.scm
@@ -50,12 +50,8 @@
 	 ansi
 	 table
 	 members-base
-	 period)
-
- ;; Convert into lookups - a list of (list period regular student)
- (define member-fees-lookup-table
-   (make-period-lookup-table
-    '(((2010 1) 500 250))))
+	 period
+	 specification)
 
  ;; Returns a matching list of (list regular student)
  (define (lookup-member-fees)
diff --git a/src/specification.scm b/src/specification.scm
index 62f59a7..e5b72a3 100644
--- a/src/specification.scm
+++ b/src/specification.scm
@@ -28,8 +28,15 @@
 (module
  specification
  (
+  member-fees-lookup-table
   )
 
- (import scheme)
+ (import scheme
+	 period)
+
+ ;; Convert into lookups - a list of (list period regular student)
+ (define member-fees-lookup-table
+   (make-period-lookup-table
+    '(((2010 1) 500 250))))
 
  )