diff --git a/apps/serial-shell/Makefile.serial-shell b/apps/serial-shell/Makefile.serial-shell
index 99472b346..9e71f70b8 100644
--- a/apps/serial-shell/Makefile.serial-shell
+++ b/apps/serial-shell/Makefile.serial-shell
@@ -1,4 +1,4 @@
-serial_shell_src = serial-shell.c
+serial-shell_src = serial-shell.c
 
 APPS += shell
 include $(CONTIKI)/apps/shell/Makefile.shell