diff --git a/k&r/04-funcs-and-prog-struct/04-glob-stack.h b/k&r/04-funcs-and-prog-struct/04-glob-stack.h
index e7c2be8..a9d7b71 100644
--- a/k&r/04-funcs-and-prog-struct/04-glob-stack.h
+++ b/k&r/04-funcs-and-prog-struct/04-glob-stack.h
@@ -1,7 +1,7 @@
 #ifndef STACK_H
 
 #define STACK_H
-#define printerr(format, ...) printf("error: " format, ##__VA_ARGS__)
+#define printerr(format, ...) printf("error: " format "\n", ##__VA_ARGS__)
 
 #define EMPTY_STACK_ERR "stack empty" 
 #define SHORT_STACK_ERR "not enough elements on stack"