diff --git a/ISO8601DateFormatter.h b/ISO8601DateFormatter.h
index df4baf9..d3cd852 100644
--- a/ISO8601DateFormatter.h
+++ b/ISO8601DateFormatter.h
@@ -35,18 +35,6 @@ typedef NSUInteger ISO8601DateFormat;
 extern unichar ISO8601DefaultTimeSeparatorCharacter;
 
 @interface ISO8601DateFormatter: NSFormatter
-{
-	NSString *lastUsedFormatString;
-	NSDateFormatter *unparsingFormatter;
-
-	NSCalendar *parsingCalendar, *unparsingCalendar;
-
-	NSTimeZone *defaultTimeZone;
-	ISO8601DateFormat format;
-	unichar timeSeparator;
-	BOOL includeTime;
-	BOOL parsesStrictly;
-}
 
 @property(nonatomic, retain) NSTimeZone *defaultTimeZone;
 
diff --git a/ISO8601DateFormatter.m b/ISO8601DateFormatter.m
index b62db98..3af8fe9 100644
--- a/ISO8601DateFormatter.m
+++ b/ISO8601DateFormatter.m
@@ -52,6 +52,18 @@ bool ISO8601DateFormatter_GlobalCachesAreWarm(void) {
 #endif
 
 @implementation ISO8601DateFormatter
+{
+	NSString *lastUsedFormatString;
+	NSDateFormatter *unparsingFormatter;
+
+	NSCalendar *parsingCalendar, *unparsingCalendar;
+
+	NSTimeZone *defaultTimeZone;
+	ISO8601DateFormat format;
+	unichar timeSeparator;
+	BOOL includeTime;
+	BOOL parsesStrictly;
+}
 
 + (void) initialize {
 	[self createGlobalCachesThatDoNotAlreadyExist];