Index: tests/Makefile
==================================================================
--- tests/Makefile
+++ tests/Makefile
@@ -79,10 +79,11 @@
 			libobjfw.${OBJFW_LIB_MAJOR}.dylib; \
 	fi
 	LD_LIBRARY_PATH=.$${LD_LIBRARY_PATH+:}$$LD_LIBRARY_PATH \
 	DYLD_LIBRARY_PATH=.$${DYLD_LIBRARY_PATH+:}$$DYLD_LIBRARY_PATH \
 	LIBRARY_PATH=.$${LIBRARY_PATH+:}$$LIBRARY_PATH \
+	ASAN_OPTIONS=allocator_may_return_null=1 \
 	${TEST_LAUNCHER} ./${PROG_NOINST}; EXIT=$$?; \
 	rm -f libobjfw.so.${OBJFW_LIB_MAJOR}; \
 	rm -f libobjfw.so.${OBJFW_LIB_MAJOR_MINOR} libobjfw.dll; \
 	rm -f libobjfw.${OBJFW_LIB_MAJOR}.dylib; \
 	exit $$EXIT