diff --git a/lib/dynamic_debug.c b/lib/dynamic_debug.c
index 0cb5679..1d25a84 100644
--- a/lib/dynamic_debug.c
+++ b/lib/dynamic_debug.c
@@ -420,7 +420,7 @@ static int ddebug_parse_flags(const char *str, unsigned int *flagsp,
 			}
 		}
 		if (i < 0) {
-			pr_err("unknown flag '%c' in \"%s\"\n", *str, str);
+			pr_err("unknown flag '%c'\n", *str);
 			return -EINVAL;
 		}
 	}