diff --git a/Makefile.include b/Makefile.include
index d8fd372480..63183234a0 100644
--- a/Makefile.include
+++ b/Makefile.include
@@ -854,8 +854,9 @@ preflash: $(BUILD_BEFORE_FLASH)
 
 # graphical memory usage analyzer
 COSY_TOOL ?= $(PKGDIRBASE)/cosy/cosy.py
+COSY_PORT ?= 12345
 cosy: $(ELFFILE) $(COSY_TOOL)
-	$(COSY_TOOL) --riot-base $(RIOTBASE) $(APPDIR) $(BOARD) $(ELFFILE) $(MAPFILE)
+	$(COSY_TOOL) --port $(COSY_PORT) --riot-base $(RIOTBASE) $(APPDIR) $(BOARD) $(ELFFILE) $(MAPFILE)
 
 ifneq (,$(TERMLOG)$(TERMTEE))
   TERMTEE ?= | tee -a $(TERMLOG)
diff --git a/dist/tools/cosy/patches/0001-cosy-allow-to-specify-port.patch b/dist/tools/cosy/patches/0001-cosy-allow-to-specify-port.patch
new file mode 100644
index 0000000000..7f0a4caa1e
Binary files /dev/null and b/dist/tools/cosy/patches/0001-cosy-allow-to-specify-port.patch differ