diff --git a/m-string.h b/m-string.h
index 67a4e45c..72ee5403 100644
--- a/m-string.h
+++ b/m-string.h
@@ -1741,7 +1741,7 @@ namespace m_string {
 #endif
 
 /* Initialize and set a string to the given formatted value. */
-#define string_init_printf(v, ...)                                           \
+#define string_init_printf(v, ...)                                            \
   (string_init (v),  string_printf (v, __VA_ARGS__) ) 
 
 /* Initialize a string with the given list of arguments.