Index: src/OFObject.m
==================================================================
--- src/OFObject.m
+++ src/OFObject.m
@@ -23,10 +23,11 @@
 #include <assert.h>
 
 #include <sys/time.h>
 
 #import "OFObject.h"
+#import "OFArray.h"
 #import "OFTimer.h"
 #import "OFRunLoop.h"
 #import "OFThread.h"
 
 #import "OFAllocFailedException.h"
@@ -104,12 +105,22 @@
 
 #if !defined(OF_APPLE_RUNTIME) || defined(__OBJC2__)
 static void
 uncaught_exception_handler(id exception)
 {
+	OFArray *backtrace = nil;
+
 	fprintf(stderr, "\nRuntime error: Unhandled exception:\n%s\n",
 	    [[exception description] UTF8String]);
+
+	if ([exception respondsToSelector: @selector(backtrace)])
+		backtrace = [exception backtrace];
+
+	if (backtrace != nil)
+		fprintf(stderr, "\nBacktrace:\n  %s\n\n",
+		    [[backtrace componentsJoinedByString: @"\n  "] UTF8String]);
+
 	abort();
 }
 #endif
 
 static void

Index: tests/TestsAppDelegate.m
==================================================================
--- tests/TestsAppDelegate.m
+++ tests/TestsAppDelegate.m
@@ -17,13 +17,16 @@
 #include "config.h"
 
 #include <stdlib.h>
 
 #import "OFString.h"
+#import "OFArray.h"
 #import "OFStdIOStream.h"
 #import "OFFile.h"
 #import "OFAutoreleasePool.h"
+
+#import "OFException.h"
 
 #import "TestsAppDelegate.h"
 
 #ifdef _PSP
 # include <pspmoduleinfo.h>
@@ -84,13 +87,21 @@
 	} @catch (id e) {
 		TestsAppDelegate *delegate =
 		    [[OFApplication sharedApplication] delegate];
 		OFString *string = [OFString stringWithFormat:
 		    @"\nRuntime error: Unhandled exception:\n%@\n", e];
+		OFString *backtrace = [[e backtrace]
+		    componentsJoinedByString: @"\n  "];
 
 		[delegate outputString: string
 			       inColor: RED];
+		if (backtrace != nil) {
+			backtrace = [OFString stringWithFormat:
+			    @"\nBacktrace:\n  %@\n\n", backtrace];
+			[delegate outputString: backtrace
+				       inColor: RED];
+		}
 		[delegate outputString: @"Press home button to exit!\n"
 			       inColor: NO_COLOR];
 		for (;;) {
 			WPAD_ScanPads();