@@ -16,12 +16,14 @@
 
 #import "OFObject.h"
 
 @class OFTimer;
 @class OFDate;
-@class OFCondition;
 @class OFRunLoop;
+#ifdef OF_THREADS
+@class OFCondition;
+#endif
 
 #ifdef OF_HAVE_BLOCKS
 typedef void (^of_timer_block_t)(OFTimer*);
 #endif
 
@@ -37,12 +39,15 @@
 	uint8_t arguments;
 	BOOL repeats;
 #ifdef OF_HAVE_BLOCKS
 	of_timer_block_t block;
 #endif
-	BOOL isValid, done;
+	BOOL isValid;
+#ifdef OF_THREADS
 	OFCondition *condition;
+	BOOL done;
+#endif
 	OFRunLoop *inRunLoop;
 }
 
 #ifdef OF_HAVE_PROPERTIES
 @property (retain) OFDate *fireDate;
@@ -308,12 +313,14 @@
  * @return The time interval in which the timer will repeat, if it is a
  *	   repeating timer
  */
 - (double)timeInterval;
 
+#ifdef OF_THREADS
 /*!
  * @brief Waits until the timer fired.
  */
 - (void)waitUntilDone;
+#endif
 
 - (void)OF_setInRunLoop: (OFRunLoop*)inRunLoop;
 @end