diff --git a/userspace/engine/logger.cpp b/userspace/engine/logger.cpp
index 340712aa..1ac1530e 100644
--- a/userspace/engine/logger.cpp
+++ b/userspace/engine/logger.cpp
@@ -128,7 +128,7 @@ void falco_logger::log(falco_logger::level priority, const std::string&& msg) {
 			}
 		} else {
 			const struct tm* ltm = std::localtime(&result);
-			static char format[] = "WWW MMM DD HH:mm:ss YYYY";
+			static const char format[] = "WWW MMM DD HH:mm:ss YYYY";
 			char tstr[sizeof(format)];
 			std::strftime(tstr, sizeof(tstr), format, ltm);
 			fprintf(stderr, "%s: %s", tstr, copy.c_str());