Index: tests/objc_sync/Makefile
==================================================================
--- tests/objc_sync/Makefile
+++ tests/objc_sync/Makefile
@@ -20,8 +20,8 @@
 	rm -f libobjfw.so.0 libobjfw.so.0.1 libobjfw.dll libobjfw.dylib; \
 	exit $$EXIT
 
 include ../../buildsys.mk
 
-CPPFLAGS += -I../../src -I../..
+CPPFLAGS += -I../../src/runtime -I../../src -I../..
 LIBS := -L../../src -lobjfw ${LIBS}
 LD = ${OBJC}

Index: tests/objc_sync/test.m
==================================================================
--- tests/objc_sync/test.m
+++ tests/objc_sync/test.m
@@ -28,19 +28,19 @@
 @end
 
 @implementation MyThread
 - main
 {
-	printf("[%s] Entering #1\n", [object cString]);
-	@synchronized (lock) {
-		printf("[%s] Entering #2\n", [object cString]);
-		@synchronized (lock) {
-			printf("[%s] Hello!\n", [object cString]);
-		}
-		printf("[%s] Left #2\n", [object cString]);
-	}
-	printf("[%s] Left #1\n", [object cString]);
+	printf("[%s] Entering #1\n", [object UTF8String]);
+	@synchronized (lock) {
+		printf("[%s] Entering #2\n", [object UTF8String]);
+		@synchronized (lock) {
+			printf("[%s] Hello!\n", [object UTF8String]);
+		}
+		printf("[%s] Left #2\n", [object UTF8String]);
+	}
+	printf("[%s] Left #1\n", [object UTF8String]);
 
 	return nil;
 }
 @end