@@ -21,11 +21,13 @@
 #include <assert.h>
 
 #import "OFTimer.h"
 #import "OFDate.h"
 #import "OFRunLoop.h"
-#import "OFCondition.h"
+#ifdef OF_THREADS
+# import "OFCondition.h"
+#endif
 
 #import "OFInvalidArgumentException.h"
 
 #import "autorelease.h"
 #import "macros.h"
@@ -233,11 +235,13 @@
 		object1 = [object1_ retain];
 		object2 = [object2_ retain];
 		arguments = arguments_;
 		repeats = repeats_;
 		isValid = YES;
+#ifdef OF_THREADS
 		condition = [[OFCondition alloc] init];
+#endif
 	} @catch (id e) {
 		[self release];
 		@throw e;
 	}
 
@@ -307,11 +311,13 @@
 		fireDate = [fireDate_ retain];
 		interval = interval_;
 		repeats = repeats_;
 		block = [block_ copy];
 		isValid = YES;
+# ifdef OF_THREADS
 		condition = [[OFCondition alloc] init];
+# endif
 	} @catch (id e) {
 		[self release];
 		@throw e;
 	}
 
@@ -332,11 +338,13 @@
 	[object1 release];
 	[object2 release];
 #ifdef OF_HAVE_BLOCKS
 	[block release];
 #endif
+#ifdef OF_THREADS
 	[condition release];
+#endif
 
 	[super dealloc];
 }
 
 - (of_comparison_result_t)compare: (id <OFComparing>)object_
@@ -378,17 +386,19 @@
 		}
 #ifdef OF_HAVE_BLOCKS
 	}
 #endif
 
+#ifdef OF_THREADS
 	[condition lock];
 	@try {
 		done = YES;
 		[condition signal];
 	} @finally {
 		[condition unlock];
 	}
+#endif
 
 	if (repeats && isValid) {
 		OFDate *old = fireDate;
 		fireDate = [[OFDate alloc]
 		    initWithTimeIntervalSinceNow: interval];
@@ -436,10 +446,11 @@
 - (BOOL)isValid
 {
 	return isValid;
 }
 
+#ifdef OF_THREADS
 - (void)waitUntilDone
 {
 	[condition lock];
 	@try {
 		if (done) {
@@ -450,11 +461,12 @@
 		[condition wait];
 	} @finally {
 		[condition unlock];
 	}
 }
+#endif
 
 - (void)OF_setInRunLoop: (OFRunLoop*)inRunLoop_
 {
 	OF_SETTER(inRunLoop, inRunLoop_, YES, 0)
 }
 @end